CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (102,271)us-gaap_NetIncomeLoss	$ 8,210us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Accretion of discount on available- for- sale debt securities	(17)	(16)
Accretion of discount on senior notes	131wres_AccretionOfDiscountOnSeniorNotes
Amortization of deferred offering costs	515	56
Depreciation, depletion, amortization and impairment	108,566	10,354
Change in fair value of derivative financial instruments	37	(807)
Stock option expense	1,079us-gaap_StockOptionPlanExpense	532us-gaap_StockOptionPlanExpense
Deferred tax (benefit)	(8)us-gaap_DeferredIncomeTaxExpenseBenefit	(8)us-gaap_DeferredIncomeTaxExpenseBenefit
Change in assets and liabilities:
Decrease (increase) in accounts receivable-trade	3,717	8,413
Decrease in other assets	(1,439)	(2,228)
Decrease in accounts payable and accruals	(4,030)	(8,817)
Decrease in other long-term liabilities	(288)	(198)
Net cash provided by operating activities	5,992	15,491
Cash flows from investing activities:
Purchase, exploration and development of oil and gas properties	(22,992)	(10,902)
Purchase of property and equipment	(451)	(446)
Net cash used in investing activities	(23,443)	(11,348)
Cash flows from financing activities:
Proceeds from Credit Facility	19,000us-gaap_ProceedsFromLinesOfCredit
Payments on debt and debentures		(14,000)us-gaap_RepaymentsOfLongTermDebt
Payments on taxes of vested restricted stock and proceeds from the exercise of options	(292)	71
Net cash provided by (used in) financing activities	18,708	(13,929)
Net increase (decrease) in cash and cash equivalents	1,257	(9,786)
Cash and cash equivalents at beginning of period	1,703	11,620
Cash and cash equivalents at end of period	2,960	1,834
Supplemental disclosure of cash flow information
Cash paid for interest, net of amounts capitalized	11,432us-gaap_InterestPaid	711us-gaap_InterestPaid
Noncash investing and financing activities
Accrued preferred stock dividend	$ 3	$ 3

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