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Income Taxes: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income tax benefit          
Deferred $ 3,075 $ 1,768 $ 1,225 $ 4,246  
Income tax benefit 3,075 1,768 1,225 4,246  
Components of net deferred tax assets          
Net deferred tax assets $ 30,310   $ 30,310   $ 26,829