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Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Stockholders' Equity [Abstract]      
Fair value of interest rate swaps, tax   $ 2,425 $ (1,674)
Other comprehensive income from currency exchange, tax $ 0 $ 3 $ 500