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Other Comprehensive Income and Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated other comprehensive loss        
Balance at the beginning of the period     $ (16,018)  
Other comprehensive loss (10,211) (10,886) (9,171) (8,079)
Balance at the end of the period (25,189)   (25,189)  
Foreign Currency Translation Adjustments
        
Accumulated other comprehensive loss        
Balance at the beginning of the period     (16,130)  
Other comprehensive loss     (9,096)  
Balance at the end of the period (25,226)   (25,226)  
Cash Flow Hedges
        
Accumulated other comprehensive loss        
Balance at the beginning of the period     112  
Other comprehensive loss     (75)  
Balance at the end of the period $ 37   $ 37