Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net loss	$ (205,141)	$ (190,289)
Net loss	(205,141)	(190,289)
Adjustments to net income (loss) to reconcile to net cash provided by operating activities:
Net change in fair value of unsettled derivatives	(64,307)	230,177
Depreciation, depletion and amortization	360,567	317,329
Impairment of properties and equipment	282,499	6,104
Impairment of goodwill	75,121	0
Exploratory dry hole costs	41,187	0
Provision for uncollectible notes receivable	(40,203)	44,038
Accretion of asset retirement obligation	4,906	5,400
Non-cash stock-based compensation	14,587	15,205
Gain on sale of properties and equipment	(754)	(43)
Amortization of debt discount and issuance costs	9,628	12,951
Deferred income taxes	(71,529)	(114,136)
Other	986	(526)
Changes in assets and liabilities	3,855	34,621
Net cash from operating activities	411,402	360,831
Cash flows from investing activities:
Capital expenditures for development of crude oil and natural gas properties	(528,850)	(352,213)
Capital expenditures for other properties and equipment	(3,740)	(1,509)
Acquisition of crude oil and natural gas properties, including settlement adjustments and deposit for pending acquisition	(14,482)	(100,000)
Proceeds from sale of properties and equipment	3,322	4,945
Sale of promissory note	40,203	0
Restricted cash	(9,250)	0
Sale of short-term investments	49,890	0
Purchases of short-term investments	(49,890)	0
Net cash from investing activities	(512,797)	(448,777)
Cash flows from financing activities:
Proceeds from issuance of equity, net of issuance costs	0	855,072
Proceeds from senior notes	0	392,250
Proceeds from Convertible Debt	0	193,979
Proceeds from revolving credit facility	0	85,000
Repayment of revolving credit facility	0	(122,000)
Redemption of convertible notes	0	(115,000)
Purchase of treasury shares	(5,325)	(5,106)
Other	(951)	593
Net cash from financing activities	(6,276)	1,284,788
Net change in cash and cash equivalents	(107,671)	1,196,842
Cash and cash equivalents, beginning of period	244,100	850
Cash and cash equivalents, end of period	136,429	1,197,692
Cash payments (receipts) for:
Interest, net of capitalized interest	45,719	19,499
Income taxes	(2,623)	167
Non-cash investing and financing activities:
Change in accounts payable related to purchases of properties and equipment	(89,974)	(31,497)
Change in asset retirement obligation, with a corresponding change to crude oil and natural gas properties, net of disposals	3,357	1,137
Purchase of properties and equipment under capital leases	$ 3,363	$ 1,231