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Income Taxes: (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Income tax benefit          
Current $ 0 $ 0 $ 0 $ 0  
Deferred 859 689 2,077 3,759  
Income tax benefit 859 $ 689 2,077 $ 3,759  
Components of net deferred tax assets          
Net deferred tax assets $ 37,727   $ 37,727   $ 35,625