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Summary of Significant Accounting Policies (Details 8) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other Expense (Income), Net:        
Foreign currency transaction (gains) losses, net $ 16,366 $ 11,761 $ 19,931 $ 9,186
Other, net (1,091) (1,695) (1,917) (2,424)
Total other expense (income), net $ 15,275 $ 10,066 $ 18,014 $ 6,762