Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net (loss) income	$ (5,806)	$ 130,410
Adjustments to reconcile net income to net cash provided by operating activities:
Accretion of discount—Asset Retirement Obligation	382	377
Depletion, depreciation and amortization	161,064	112,871
Stock-based compensation expense	4,041	4,599
Loss (gain) from equity investments	2,171	(113,257)
Interest income - note receivable		(25)
Unrealized loss on derivative instruments	3,309	6,433
Deferred income tax (benefit) expense	(2,735)	55,550
Amortization of loan commitment fees	1,416	637
Amortization of note discount and premium	(1,065)	158
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	17,237	(48,631)
(Increase) decrease in accounts receivable—related party	(44)	2,490
Increase in prepaid expenses	(11,454)	(994)
(Decrease) increase in accounts payable and accrued liabilities	(28,522)	53,988
Settlement of asset retirement obligation	(1,120)	(3,097)
Net cash provided by operating activities	138,874	201,509
Cash flows from investing activities:
Deductions to cash held in escrow	8	8
Additions to other property and equipment	(4,154)	(1,759)
Additions to oil and gas properties	(898,639)	(672,967)
Proceeds from sale of oil and gas properties	1,679	0
Proceeds from sale of investments	0	89,120
Deductions to cash held in escrow	(75,005)	0
Contributions to equity method investments	(8,267)	(39,162)
Distributions from equity method investments	4,612	0
Net cash used in investing activities	(979,766)	(624,760)
Cash flows from financing activities:
Principal payments on borrowings	(350,088)	(85)
Borrowings on line of credit	250,000	40,000
Proceeds from bond issuance	350,000	0
Debt issuance costs and loan commitment fees	(7,738)	(975)
Proceeds from issuance of common stock, net of offering costs and exercise of stock options	981,866	648
Net cash provided by financing activities	1,224,040	39,588
Net increase (decrease) in cash and cash equivalents	383,148	(383,663)
Cash and cash equivalents at beginning of period	142,340	458,956
Cash and cash equivalents at end of period	525,488	75,293
Supplemental disclosure of cash flow information:
Interest payments	24,176	11,738
Income tax payments	29,753	16,700
Supplemental disclosure of non-cash transactions:
Capitalized stock based compensation	2,694	3,066
Asset retirement obligation capitalized	4,077	3,613
Interest capitalized	8,399	6,245
Foreign currency translation loss on investment in Grizzly Oil Sands ULC	$ (11,737)	$ (462)