Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities - cash provided by (used in):
Net income (loss)	$ 47,493	$ (89,698)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depletion, depreciation and amortization	50,540	31,753
Unrealized loss on commodity derivatives	7,606	13,218
Deferred gain on sale of liquids gathering system	(2,638)	(2,638)
Stock compensation	8,810	851
Non-cash reorganization items, net		43,576
Amortization of deferred financing costs	2,727
Other	209	172
Net changes in operating assets and liabilities:
Accounts receivable	12,561	14,680
Other current assets	2,485	203
Other non-current assets	30
Accounts payable	(5,263)	22,968
Accrued liabilities	(7,486)	38,691
Production taxes payable	23,622	18,512
Interest payable	17,172	85,339
Other long-term obligations	(12,708)	(8,292)
Income taxes payable/receivable	6,836	2,099
Net cash provided by operating activities	151,996	171,434
Investing Activities - cash provided by (used in):
Oil and gas property expenditures	(134,500)	(89,360)
Change in capital cost accrual	(8,079)	(919)
Inventory	(5,074)	(2,302)
Purchase of capital assets	(1,196)	(234)
Net cash used in investing activities	(148,849)	(92,815)
Financing activities - cash provided by (used in):
Repurchased shares/net share settlements	(2,061)	(44)
Net cash used in financing activities	(2,061)	(44)
Increase in cash during the period	1,086	78,575
Cash, cash equivalents, and restricted cash, beginning of period	18,269	405,049
Cash, cash equivalents and restricted cash, end of period	19,355	$ 483,624
Credit Agreement
Financing activities - cash provided by (used in):
Borrowings under Credit Agreement	191,000
Payments under Credit Agreement	$ (191,000)