Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Narrative) (Details)

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Long-Term Debt (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended 0 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Senior Notes [Member]
Dec. 31, 2013
Senior Notes [Member]
Sep. 30, 2013
Senior Notes [Member]
Dec. 21, 2012
Senior Notes [Member]
Oct. 17, 2012
Senior Notes [Member]
Oct. 09, 2012
Senior Notes [Member]
Mar. 31, 2014
Building Loans [Member]
Dec. 31, 2013
Building Loans [Member]
Mar. 31, 2011
Building Loans [Member]
Oct. 09, 2012
Minimum [Member]
Senior Notes [Member]
Oct. 09, 2012
Maximum [Member]
Senior Notes [Member]
Dec. 18, 2012
Nova Scotia, Amegy, KeyBank [Member]
Mar. 31, 2014
Nova Scotia, Amegy, KeyBank [Member]
Dec. 27, 2013
Nova Scotia, Amegy, KeyBank [Member]
Apr. 23, 2014
Nova Scotia, Amegy, KeyBank [Member]
Subsequent Event [Member]
Dec. 18, 2012
Nova Scotia, Amegy, KeyBank [Member]
Base Rate Loans [Member]
Dec. 18, 2012
Nova Scotia, Amegy, KeyBank [Member]
Base Rate Loans [Member]
Federal Funds Rate [Member]
Dec. 18, 2012
Nova Scotia, Amegy, KeyBank [Member]
Base Rate Loans [Member]
Eurodollar [Member]
Dec. 18, 2012
Nova Scotia, Amegy, KeyBank [Member]
Euro Dollar Loans [Member]
Mar. 31, 2014
Nova Scotia, Amegy, KeyBank [Member]
Letter of Credit [Member]
Apr. 23, 2014
Nova Scotia, Amegy, KeyBank [Member]
Letter of Credit [Member]
Subsequent Event [Member]
Debt Instrument [Line Items]                                              
Interest cost capitalized, undeveloped properties $ 2,318,000 $ 2,629,000                                          
Interest capitalized 2,318,000 2,629,000                                          
Revolving credit facility                               1,500,000,000.0              
Interest expense 3,885,000 3,479,000                                          
Borrowing capacity                             150,000,000.0   275,000,000.0         20,000,000.0 70,000,000.0
Applicable rate, minimum                                   0.50%     1.50%    
Applicable rate, maximum                                   1.50%     2.50%    
Stated interest rate         7.75%   7.75%       5.82%                        
Credit facility outstanding                             0             6,400,000.0  
Remaining borrowing capacity                             143,600,000                
Basis spread                                     0.50% 1.00%      
Debt instrument, description of rate                           LIBOR01                  
Debt covenant ratio for reasonable transactions 2.00                                            
Debt covenant ratio for EBITDAX 3.00                                            
Building Loan Outstanding Amount Of Building Loan Refinanced     300,000,000 [1] 300,000,000 [1]     300,000,000.0 [1]   1,953,000 [2] 1,995,000 [2] 2,400,000                        
Loan, periodic payment                 22,000                            
Debt issued           50,000,000.0 250,000,000.0                                
Redemption of principal amount plus aggregate net proceeds               100.00%         35.00%                    
Percentage of notes required to be outstanding for redemption                       65.00%                      
Discount issue price, price             98.534%                                
Premium issue price, percent           101.00%                                  
Unamortized discount 3,100,000           3,700,000                                
Effective interest rate           7.531% 8.00%                                
Unamortized premium $ 400,000         $ 500,000                                  
[1] On October 17, 2012, the Company issued $250.0 million in aggregate principal amount of senior unsecured notes due 2020 (the "October Notes") to qualified institutional buyers pursuant to Rule 144A under the Securities Act and to certain non-U.S. persons in accordance with Regulation S under the Securities Act (the "October Notes Offering") under an indenture among the Company, its subsidiary guarantors and Wells Fargo Bank, National Association, as the trustee (the "senior note indenture"). On December 21, 2012, the Company issued an additional $50.0 million in aggregate principal amount of senior unsecured notes due 2020 (the "December Notes") to qualified institutional buyers pursuant to Rule 144A under the Securities Act and to certain non-U.S. persons in accordance with Regulation S under the Securities Act ("the December Notes Offering"). The December Notes were issued as additional securities under the senior note indenture. The October Notes Offering and the December Notes Offering are collectively referred to as the "Notes Offerings". The Company used a portion of the net proceeds from the October Notes Offering to repay all amounts outstanding at such time under its revolving credit facility. The Company used the remaining net proceeds of October Notes Offering and the net proceeds of the December Notes Offering for general corporate purposes, which included funding a portion of its 2013 capital development plan. Under the senior note indenture, interest on the Notes accrues at a rate of 7.75% per annum on the outstanding principal amount from October 17, 2012, payable semi-annually on May 1 and November 1 of each year, commencing on May 1, 2013. The Notes are the Company's senior unsecured obligations and rank equally in the right of payment with all of the Company's other senior indebtedness and senior in right of payment to any future subordinated indebtedness. All of the Company's existing and future restricted subsidiaries that guarantee the Company's secured revolving credit facility or certain other debt guarantee the Notes; provided, however, that the Notes are not guaranteed by Grizzly Holdings, Inc. and will not be guaranteed by any of the Company's future unrestricted subsidiaries. The Company may redeem some or all of the Notes at any time on or after November 1, 2016, at the redemption prices listed in the senior note indenture. Prior to November 1, 2016, the Company may redeem the Notes at a price equal to 100% of the principal amount plus a “make-whole” premium. In addition, prior to November 1, 2015, the Company may redeem up to 35% of the aggregate principal amount of the Notes with the net proceeds of certain equity offerings, provided that at least 65% of the aggregate principal amount of the Notes initially issued remains outstanding immediately after such redemption.
[2] In March 2011, the Company entered into a new building loan agreement for the office building it occupies in Oklahoma City, Oklahoma. The new loan agreement refinanced the $2.4 million outstanding under the previous building loan agreement. The new agreement matures in February 2016 and bears interest at the rate of 5.82% per annum. The new building loan requires monthly interest and principal payments of approximately $22,000 and is collateralized by the Oklahoma City office building and associated land.