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Income Taxes: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Income tax benefit (provision)      
Deferred $ (1,850) $ 2,478  
Income tax (provision) benefit (1,850) 2,478  
Components of net deferred tax assets      
Net deferred tax assets $ 27,282   $ 26,829