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Income Taxes: (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income tax benefit          
Current $ 0 $ 0 $ 0 $ 0  
Deferred 283 2,898 1,218 3,070  
Income tax benefit 283 $ 2,898 1,218 $ 3,070  
Components of net deferred tax assets          
Net deferred tax assets $ 36,843   $ 36,843   $ 35,625