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Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement Of Stockholders Equity [Abstract]    
Tax effect on unrealized gain on hedging derivative $ 31 $ 20
Tax effect on unrealized losses on available-for-sale securities $ 0