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Income Taxes: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income tax benefit
Current	$ 0us-gaap_CurrentIncomeTaxExpenseBenefit	$ 0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	935us-gaap_DeferredIncomeTaxExpenseBenefit	172us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax benefit	935us-gaap_IncomeTaxExpenseBenefit	172us-gaap_IncomeTaxExpenseBenefit
Components of net deferred tax assets
Net deferred tax assets	$ 36,560us-gaap_DeferredTaxAssetsLiabilitiesNet		$ 35,625us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.