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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Net unrealized loss on hedging contracts, net of tax of $0.1 million in 2011 $ 0 $ (762)
Net unrealized (loss) gain on pension, net of tax (483) 115
Foreign currency effects from intercompany long-term investment transactions, net of tax of $4.4 million and $4.9 million in 2012 and 2011, respectively 5,954 7,369
Foreign currency translation adjustments 38,520 9,182
Accumulated other comprehensive income 43,991 15,904
Accumulted Other Comprehensive Income (Loss) Tax [Abstract]    
Derivatives Qualifying as Hedges, Tax Effect   100
Intercompany Long Term Investment Foreign Currency Translation Adjustment, Tax $ 4,400 $ 4,900