Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net loss	$ (107,667)	$ (50,198)
Adjustments to reconcile net loss to net cash provided by operating activities
Unrealized loss on derivatives	6,839	8,557
Depletion, depreciation and amortization	28,923	46,470
Accretion of asset retirement obligations	264	112
Full-cost ceiling impairment	80,462	67,127
Stock-based compensation expense	2,243	2,337
Deferred income tax (benefit) provision	0	(26,390)
Amortization of debt issuance cost	300	0
Net (gain) loss on asset sales and inventory impairment	(1,065)	97
Changes in operating assets and liabilities
Accounts receivable	7,307	2,140
Lease and well equipment inventory	150	(112)
Prepaid expenses	(47)	(364)
Other assets	97	193
Accounts payable, accrued liabilities and other current liabilities	2,591	45,703
Royalties payable	(3,975)	(2,907)
Advances from joint interest owners	2,524	1,378
Income taxes payable	(2,463)	(444)
Other long-term liabilities	1,875	(353)
Net cash provided by operating activities	18,358	93,346
Investing activities
Oil and natural gas properties capital expenditures	(74,370)	(127,440)
Expenditures for other property and equipment	(27,409)	(14,241)
Business combination, net of cash acquired	0	(24,028)
Restricted cash	43,337	0
Restricted cash in less-than-wholly-owned subsidiaries	510	(383)
Net cash used in investing activities	(57,932)	(166,092)
Financing activities
Borrowings under Credit Agreement	0	70,000
Proceeds from issuance of common stock	142,350	0
Cost to issue equity	(614)	0
Capital contribution from non-controlling interest owners in less-than-wholly-owned subsidiaries	0	450
Taxes paid related to net share settlement of stock-based compensation	(565)	(50)
Net cash provided by financing activities	141,171	70,400
Increase (decrease) in cash	101,597	(2,346)
Cash at beginning of period	16,732	8,407
Cash at end of period	$ 118,329	$ 6,061