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Income Taxes: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Income tax benefit          
Current $ 125   $ (156)    
Deferred 1,352 3,075 1,877 1,225  
Income tax benefit 1,477 3,075 1,721 1,225  
Components of net deferred tax assets          
Net deferred tax assets $ 31,399   $ 31,399   $ 33,414