Guarantor Financial Information (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed consolidating financial statements
Current assets	$ 631,186	$ 68,805
Property and equipment, net	856,136	1,201,284
Investments in subsidiaries	0	0
Other assets	7,317	17,331
Total assets	1,494,639	1,287,420	$ 1,501,633
Current liabilities	106,766	65,739
Non-current liabilities:
Long-term debt	847,995	742,410
Fair value of commodity derivatives	0
Fair value of common stock warrants	246,743	0
Deferred income taxes	76,590	108,996
Other	56,014	70,677
TOTAL NON-CURRENT LIABILITIES	1,227,342	922,083
Equity	160,531	299,598	$ 397,794	$ 353,783
Total liabilities and equity	1,494,639	1,287,420
Issuer
Condensed consolidating financial statements
Current assets	678,174	112,861
Property and equipment, net	585,803	892,791
Investments in subsidiaries	289,424	324,484
Other assets	5,197	6,681
Total assets	1,558,598	1,336,817
Current liabilities	284,955	276,354
Non-current liabilities:
Long-term debt	847,995	742,410
Fair value of commodity derivatives	12,895
Fair value of common stock warrants	246,743
Deferred income taxes	99,879	90,387
Other	11,418	33,886
TOTAL NON-CURRENT LIABILITIES	1,218,930	866,683
Equity	54,713	193,780
Total liabilities and equity	1,558,598	1,336,817
Guarantor Subsidiaries
Condensed consolidating financial statements
Current assets	244,756	272,310
Property and equipment, net	267,128	304,936
Investments in subsidiaries	0	0
Other assets	2,120	10,650
Total assets	514,004	587,896
Current liabilities	101,349	102,267
Non-current liabilities:
Long-term debt	0	0
Fair value of commodity derivatives	0
Fair value of common stock warrants	0
Deferred income taxes	85,113	130,471
Other	44,290	36,539
TOTAL NON-CURRENT LIABILITIES	129,403	167,010
Equity	283,252	318,619
Total liabilities and equity	514,004	587,896
Non-Guarantor Subsidiary
Condensed consolidating financial statements
Current assets	1,314	1,441
Property and equipment, net	3,205	3,557
Investments in subsidiaries	0	0
Other assets	0	0
Total assets	4,519	4,998
Current liabilities	111	117
Non-current liabilities:
Long-term debt	0	0
Fair value of commodity derivatives	0
Fair value of common stock warrants	0
Deferred income taxes	(2,070)	(1,236)
Other	306	252
TOTAL NON-CURRENT LIABILITIES	(1,764)	(984)
Equity	6,172	5,865
Total liabilities and equity	4,519	4,998
Adjustments/ Eliminations
Condensed consolidating financial statements
Current assets	(293,058)	(317,807)
Property and equipment, net	0	0
Investments in subsidiaries	(289,424)	(324,484)
Other assets	0	0
Total assets	(582,482)	(642,291)
Current liabilities	(279,649)	(312,999)
Non-current liabilities:
Long-term debt	0	0
Fair value of commodity derivatives	(12,895)
Fair value of common stock warrants	0
Deferred income taxes	(106,332)	(110,626)
Other	0	0
TOTAL NON-CURRENT LIABILITIES	(119,227)	(110,626)
Equity	(183,606)	(218,666)
Total liabilities and equity	$ (582,482)	$ (642,291)