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Income Taxes: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Income tax benefit      
Current $ (281)    
Deferred 524 (1,850)  
Income tax benefit (provision) 243 (1,850)  
Components of net deferred tax assets      
Net deferred tax assets $ 33,843   $ 33,414