CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 13,531	$ 11,256
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	41,199	23,467
Deferred income taxes	8,471	7,048
Stock-based compensation	6,797	4,378
Amortization of deferred financing costs	562	219
Amortization of premium on senior notes	(307)
Accretion of contractual obligation for land acquisition	190	190
Derivative loss	8,778	5,116
Gain on sale of oil and gas properties	(6,514)
Other	(2)	73
Changes in current assets and liabilities:
Accounts receivable	(12,721)	(6,912)
Prepaid expenses and other assets	(2,637)	81
Accounts payable and accrued liabilities	20,337	(5,068)
Settlement of asset retirement obligations		(49)
Net cash provided by operating activities	77,684	39,799
Cash flows from investing activities:
Acquisition of oil and gas properties	(1,202)	(934)
Proceeds from Sale of Oil and Gas Properties	6,000
Exploration and development of oil and gas properties	(123,835)	(64,334)
Natural gas plant capital expenditures	(194)	(3,275)
Derivative cash settlements	(2,227)	(1,507)
Additions to property and equipment - non oil and gas	(838)	(1,386)
Net cash used in investing activities	(122,296)	(71,436)
Cash flows from financing activities:
Proceeds from credit facility		33,500
Offering costs related to sale of senior subordinated notes	(140)
Payment of employee tax withholdings in exchange for the return of common stock	(4,461)	(2,908)
Deferred financing costs	(26)	(52)
Net cash (used in) provided by financing activities	(4,627)	30,540
Net change in cash and cash equivalents	(49,239)	(1,097)
Cash and cash equivalents:
Beginning of period	180,582	4,267
End of period	131,343	3,170
Supplemental cash flow disclosure:
Cash paid for interest	464	1,469
Changes in working capital related to drilling expenditures, natural gas plant expenditures, and property acquisition	$ 23,238	$ (5,460)