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Income Taxes: (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income tax benefit
Current	$ 0	$ 0
Deferred	(1,317)	935
Income tax (expense) benefit	(1,317)	$ 935
Components of net deferred tax assets
Net deferred tax assets	$ 37,591		$ 38,847

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

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