Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES:
Net (loss) income	$ (174,104,000)	$ 56,172,000	$ 72,256,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depletion, depreciation and amortization	109,319,000	106,802,000	76,956,000
Impairment of oil and gas properties	220,197,000	0	0
Amortization of debt issuance costs	1,561,000	1,546,000	1,048,000
Gain on debt extinguishment	(10,563,000)
Unrealized loss (gain) on commodity derivatives	33,214,000	(42,113,000)	4,596,000
Gain on sale of equity method investment			(90,743,000)
Exploration expense	1,836,000	3,831,000	2,238,000
Share-based compensation expense	7,954,000	8,247,000	5,901,000
Deferred income tax (benefit) expense	(93,140,000)	33,717,000	42,078,000
Equity in losses (earnings) of investee		181,000	(156,000)
Other non-cash items	(172,000)	(179,000)
Changes in operating assets and liabilities:
Accounts receivable	7,878,000	3,262,000	(10,239,000)
Prepaid expenses and other current assets	(325,000)	(179,000)	(45,000)
Accounts payable	964,000	(2,262,000)	1,478,000
Oil, NGL and gas sales payable	(4,291,000)	2,435,000	1,141,000
Accrued liabilities	2,388,000	144,000	4,186,000
Cash provided by operating activities	102,716,000	171,604,000	110,695,000
INVESTING ACTIVITIES:
Additions to oil and gas properties	(151,178,000)	(390,506,000)	(296,409,000)
Proceeds from sale of equity method investment, net of contributions		(181,000)	100,791,000
Change in restricted cash		7,350,000	(7,350,000)
Additions to furniture, fixtures and equipment, net	(67,000)	(3,024,000)	(429,000)
Change in working capital related to investing activities	(66,102,000)	9,189,000	16,073,000
Cash used in investing activities	(217,347,000)	(377,172,000)	(187,324,000)
FINANCING ACTIVITIES:
Borrowings under credit facility	272,000,000	353,921,000	129,950,000
Repayment of amounts outstanding under credit facility	(149,000,000)	(203,921,000)	(235,950,000)
Proceeds from issuance of senior notes			242,824,000
Extinguishment of senior notes	(8,722,000)
Tax withholdings related to restricted stock	(210,000)	(587,000)	(1,188,000)
Proceeds from issuance of common stock upon exercise of stock options			58,000
Loan origination fees		(2,174,000)	(1,071,000)
Change in working capital related to financing activities	731,000
Cash provided by financing activities	114,799,000	147,239,000	134,623,000
CHANGE IN CASH AND CASH EQUIVALENTS	168,000	(58,329,000)	57,994,000
CASH AND CASH EQUIVALENTS, beginning of year	432,000	58,761,000	767,000
CASH AND CASH EQUIVALENTS, end of year	600,000	432,000	58,761,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes		404,000
Cash paid for interest	23,634,000	20,232,000	12,392,000
SUPPLEMENTAL DISCLOSURE OF NON-CASH TRANSACTION:
Acquisition of oil and gas properties		510,000	132,000
Asset retirement obligations capitalized	$ 151,000	$ 898,000	$ 584,000

Non-cash exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

No definition available.