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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Cash flows from operating activities:      
Net income (loss) $ (64,455) $ (18,041)  
Equity in earnings (loss) of subsidiaries 0 0  
Depreciation, depletion and amortization 122,449 118,478  
Gain on extinguishment of debt (7,016) 0  
Impairment 3,562 5,321  
Deferred income taxes (27,629) (7,376)  
Derivative instruments (14,375) (47,072)  
Stock-based compensation expenses 6,730 7,606  
Deferred financing costs amortization and other 5,066 1,655  
Change in accounts receivable (995) 63,313  
Change in inventory 349 (602)  
Change in prepaid expenses 241 1,892  
Change in other current assets 4 5,539  
Change in other assets 77 0  
Change in accounts payable, interest payable and accrued liabilities (64,056) (42,341)  
Change in other current liabilities (6,000) 0  
Change in other liabilities (3) (11)  
Net cash provided by (used in) operating activities (46,051) 88,361  
Cash flows from investing activities:      
Capital expenditures (103,411) (359,113)  
Derivative settlements 73,313 109,259  
Advances from joint interest partners (257) (828)  
Net cash used in investing activities (30,355) (250,682)  
Cash flows from financing activities:      
Repurchase of senior unsecured notes (22,308) 0  
Proceeds from revolving credit facility 214,000 145,000  
Principal payments on revolving credit facility (287,000) (480,000)  
Deferred financing costs (751) 0  
Proceeds from sale of common stock 183,164 463,218  
Purchases of treasury stock (1,032) (1,520)  
Investment in / capital contributions from subsidiaries 0 0  
Net cash provided by financing activities 86,073 126,698  
Increase (decrease) in cash and cash equivalents 9,667 (35,623)  
Beginning of period 9,730 45,811 $ 45,811
End of period 19,397 10,188 9,730
Parent/Issuer [Member]      
Cash flows from operating activities:      
Net income (loss) (64,455) (18,041)  
Equity in earnings (loss) of subsidiaries 37,327 (12,619)  
Depreciation, depletion and amortization 0 0  
Gain on extinguishment of debt (7,016)    
Impairment 0 0  
Deferred income taxes (8,096) (13,180)  
Derivative instruments 0 0  
Stock-based compensation expenses 6,547 7,542  
Deferred financing costs amortization and other 1,701 1,119  
Change in accounts receivable (85) (251)  
Change in inventory 0 0  
Change in prepaid expenses 139 149  
Change in other current assets 0 0  
Change in other assets 77    
Change in accounts payable, interest payable and accrued liabilities (122,242) 27,293  
Change in other current liabilities 0    
Change in other liabilities 0 0  
Net cash provided by (used in) operating activities (156,103) (7,988)  
Cash flows from investing activities:      
Capital expenditures 0 0  
Derivative settlements 0 0  
Advances from joint interest partners 0 0  
Net cash used in investing activities 0 0  
Cash flows from financing activities:      
Repurchase of senior unsecured notes (22,308)    
Proceeds from revolving credit facility 0 0  
Principal payments on revolving credit facility 0 0  
Deferred financing costs 0    
Proceeds from sale of common stock 183,164 463,218  
Purchases of treasury stock (1,032) (1,520)  
Investment in / capital contributions from subsidiaries (4,408) (453,712)  
Net cash provided by financing activities 155,416 7,986  
Increase (decrease) in cash and cash equivalents (687) (2)  
Beginning of period 777 776 776
End of period 90 774 777
Combined Guarantor Subsidiaries [Member]      
Cash flows from operating activities:      
Net income (loss) (37,327) 12,619  
Equity in earnings (loss) of subsidiaries 0 0  
Depreciation, depletion and amortization 122,449 118,478  
Gain on extinguishment of debt 0    
Impairment 3,562 5,321  
Deferred income taxes (19,533) 5,804  
Derivative instruments (14,375) (47,072)  
Stock-based compensation expenses 183 64  
Deferred financing costs amortization and other 3,365 536  
Change in accounts receivable 96,353 11,255  
Change in inventory 349 (602)  
Change in prepaid expenses 102 1,743  
Change in other current assets 4 5,539  
Change in other assets 0    
Change in accounts payable, interest payable and accrued liabilities (39,077) (17,325)  
Change in other current liabilities (6,000)    
Change in other liabilities (3) (11)  
Net cash provided by (used in) operating activities 110,052 96,349  
Cash flows from investing activities:      
Capital expenditures (103,411) (359,113)  
Derivative settlements 73,313 109,259  
Advances from joint interest partners (257) (828)  
Net cash used in investing activities (30,355) (250,682)  
Cash flows from financing activities:      
Repurchase of senior unsecured notes 0    
Proceeds from revolving credit facility 214,000 145,000  
Principal payments on revolving credit facility (287,000) (480,000)  
Deferred financing costs (751)    
Proceeds from sale of common stock 0 0  
Purchases of treasury stock 0 0  
Investment in / capital contributions from subsidiaries 4,408 453,712  
Net cash provided by financing activities (69,343) 118,712  
Increase (decrease) in cash and cash equivalents 10,354 (35,621)  
Beginning of period 8,953 45,035 45,035
End of period 19,307 9,414 8,953
Intercompany Eliminations [Member]      
Cash flows from operating activities:      
Net income (loss) 37,327 (12,619)  
Equity in earnings (loss) of subsidiaries (37,327) 12,619  
Depreciation, depletion and amortization 0 0  
Gain on extinguishment of debt 0    
Impairment 0 0  
Deferred income taxes 0 0  
Derivative instruments 0 0  
Stock-based compensation expenses 0 0  
Deferred financing costs amortization and other 0 0  
Change in accounts receivable (97,263) 52,309  
Change in inventory 0 0  
Change in prepaid expenses 0 0  
Change in other current assets 0 0  
Change in other assets 0    
Change in accounts payable, interest payable and accrued liabilities 97,263 (52,309)  
Change in other current liabilities 0    
Change in other liabilities 0 0  
Net cash provided by (used in) operating activities 0 0  
Cash flows from investing activities:      
Capital expenditures 0 0  
Derivative settlements 0 0  
Advances from joint interest partners 0 0  
Net cash used in investing activities 0 0  
Cash flows from financing activities:      
Repurchase of senior unsecured notes 0    
Proceeds from revolving credit facility 0 0  
Principal payments on revolving credit facility 0 0  
Deferred financing costs 0    
Proceeds from sale of common stock 0 0  
Purchases of treasury stock 0 0  
Investment in / capital contributions from subsidiaries 0 0  
Net cash provided by financing activities 0 0  
Increase (decrease) in cash and cash equivalents 0 0  
Beginning of period 0 0 0
End of period $ 0 $ 0 $ 0