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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]    
Unrealized losses on available-for-sale securities, taxes $ 0  
Unrealized gains on hedging derivatives, taxes $ 31 $ 20