Annual report pursuant to Section 13 and 15(d)

Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details)

v3.3.1.900
Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Acquisition costs $ 621,519 $ 361,167 $ 273,146 $ 522,872
Acquisition costs, total 1,778,704      
Exploration costs 0 0 0 0
Exploration costs, total 0      
Development costs 28,833 4,688 1,436 457
Development costs, total 35,414      
Capitalized interest 3,674 (2,353) 2,262 0
Capitalized interest, total 3,583      
Total oil and gas properties not subject to amortization 654,026 363,502 $ 276,844 $ 523,329
Total oil and gas properties not subject to amortization, total 1,817,701 $ 1,465,538    
Utica        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 1,812,256      
Niobrara        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 4,932      
Southern Louisiana        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 372      
Bakken        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 96      
Other        
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total $ 45