Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL)

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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Capitalized costs of oil and natural gas properties excluded from amortization $ 2,877,001 $ 2,873,037
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, dividend rate 12.00% 12.00%
Preferred stock, shares authorized (in shares) 30,000 30,000
Preferred stock Series A, issued (in shares) 0 0
Preferred stock Series A, outstanding (in shares) 0 0
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares, issued (in shares) 159,421,965 162,986,045
Common stock, shares, outstanding (in shares) 159,421,965 162,986,045