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Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Consolidated Statements of Comprehensive Income [Abstract]    
Taxes (benefits) on unrealized gain $ (3) $ 140
Taxes on reclassification adjustment $ 0 $ 8