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Income Taxes: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Income tax benefit |  |  |  |  |
Current | $ 0 | $ 125 | $ 0 | $ (156) |
Deferred | 2,898 | 1,352 | 3,070 | 1,877 |
Income tax benefit | 2,898 | 1,477 | 3,070 | 1,721 |
Components of net deferred tax assets |  |  |  |  |
Net deferred tax assets | $ 34,426 |  | $ 34,426 |  | $ 31,356

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