CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net loss	$ (58,993)	$ (78,909)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depletion, depreciation and amortization	33,817	39,617
Deferred income taxes	(1,951)	5,783
Unsuccessful well costs	2,222	83,627
Change in fair value of derivatives	(2,377)	(34,980)
Cash settlements on derivatives (including $56.6 million and $51.3 million on commodity hedges during 2016 and 2015)	56,901	53,932
Equity-based compensation	10,635	25,183
Gain on sale of assets		(22,751)
Other	14,969	1,171
Changes in assets and liabilities:
Decrease in receivables	39,894	35,926
(Increase) decrease in inventories	2,237	(18,443)
(Increase) decrease in prepaid expenses and other	13,674	(4,399)
Decrease in accounts payable	(58,501)	(58,286)
Decrease in accrued liabilities	(36,910)	(36,451)
Net cash provided by (used in) operating activities	15,617	(8,980)
Investing activities
Oil and gas assets	(226,571)	(184,899)
Other property	(47)	(280)
Restricted cash	(12)	(59)
Net cash used in investing activities	(226,630)	(185,238)
Financing activities
Borrowings under long-term debt	150,000
Purchase of treasury stock	(1,074)	(148)
Net cash provided by (used in) financing activities	148,926	(148)
Net decrease in cash and cash equivalents	(62,087)	(194,366)
Cash and cash equivalents at beginning of period	275,004	554,831
Cash and cash equivalents at end of period	212,917	360,465
Cash paid for:
Interest	14,611	32,179
Income taxes	2,734	$ 10,000
Non-cash activities:
Conversion of joint interest billings receivable to long-term note receivable	$ 3,417