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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 5,428 $ 2,639 $ (11,047)
State 130 695 45
Total current tax expense 5,558 3,334 (11,002)
Deferred:      
Federal (296) 5,380 9,743
State 259 904 (389)
Total deferred tax expense (37) 6,284 9,354
Total $ 5,521 $ 9,618 $ (1,648)