CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating revenues
Oil and gas sales	$ 24,590us-gaap_OilAndGasSalesRevenue	$ 32,879us-gaap_OilAndGasSalesRevenue
Transportation revenue	1,188	1,323
Total revenues	25,778us-gaap_OilAndGasRevenue	34,202us-gaap_OilAndGasRevenue
Operating expenses
Lease operating expenses and taxes	12,508wres_LeaseOperatingExpenseAndTaxes	9,502wres_LeaseOperatingExpenseAndTaxes
Depreciation, depletion and amortization	17,191	10,354
Impairment	91,375us-gaap_AssetImpairmentCharges
Transportation expenses	577	565
General and administrative	5,019us-gaap_GeneralAndAdministrativeExpense	3,966us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	126,670us-gaap_OperatingExpenses	24,387us-gaap_OperatingExpenses
Income (loss) from operations	(100,892)us-gaap_OperatingIncomeLoss	9,815us-gaap_OperatingIncomeLoss
Other income (expense)
Interest and other income	17	134
Interest expense	(5,234)us-gaap_InterestExpense	(754)us-gaap_InterestExpense
Loss on contingent consideration	(130)wres_GainLossOnContingentConsideration
Gain (loss) on derivative financial instruments	3,960	(993)
Total other income (expense)	(1,387)us-gaap_NonoperatingIncomeExpense	(1,613)us-gaap_NonoperatingIncomeExpense
Income (loss) before taxes	(102,279)	8,202
Deferred income tax benefit	(8)us-gaap_DeferredIncomeTaxExpenseBenefit	(8)us-gaap_DeferredIncomeTaxExpenseBenefit
Net income (loss)	(102,271)us-gaap_NetIncomeLoss	8,210us-gaap_NetIncomeLoss
Less dividends and accretion on preferred shares	3	3
Net income (loss) applicable to common stockholders	$ (102,274)	$ 8,207
Earnings (loss) per share-Basic (in dollars per share)	$ (1.26)us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic
Earnings (loss) per share-Diluted (in dollars per share)	$ (1.26)us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding-Basic (in shares)	80,869,169	73,104,129
Weighted average common shares outstanding-Diluted (in shares)	80,869,169	73,215,840

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of the cost of borrowed funds accounted for as interest expense.

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