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Income Taxes: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Income tax benefit |  |  |  |  |
Current | $ 0 | $ (79) | $ 0 | $ (235) |
Deferred | 689 | 622 | 3,759 | 2,498 |
Income tax benefit | 689 | 543 | 3,759 | 2,263 |
Components of net deferred tax assets |  |  |  |  |
Net deferred tax assets | $ 35,115 |  | $ 35,115 |  | $ 31,356

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