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Changes in Accumulated Other Comprehensive Loss by Component (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]                
Foreign currency translation, Beginning balance $ (26,157) $ (10,165) $ (30,335) $ (12,410)        
Foreign currency translation, Other comprehensive income (loss) before reclassifications 2,186 (14,359) 6,364 (12,114)        
Foreign currency translation, Amounts reclassified from accumulated other comprehensive loss                  
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax 2,186 (14,359) 6,364 (12,114)        
Foreign currency translation, Ending balance (23,971) (24,524) (23,971) (24,524)        
Unrealized gain (loss) on hedging activities, Beginning balance (254) 2,399 (111) 2,140        
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax 570 (2,418) 216 (1,423)        
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss (332) (519) (121) (1,255)        
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax 238 (2,937) 95 (2,678)        
Unrealized gain (loss) on hedging activities, Ending balance (16) (538) (16) (538)        
Post employment benefit liability, Beginning balance (12) (12) (12) (12)        
Post employment benefit liability, Other comprehensive loss before reclassifications                  
Post employment benefit liability, Amounts reclassified from accumulated other comprehensive loss                  
Post employment benefit liability, Other comprehensive income (loss)                  
Post employment benefit liability, Ending balance (12) (12) (12) (12)        
Total, Other comprehensive income (loss) before reclassifications 2,756 (16,777) 6,580 (13,537)        
Total, Amounts reclassified from accumulated other comprehensive loss (332) (519) (121) (1,255)        
Other comprehensive income (loss), net of tax 2,424 (17,296) 6,459 (14,792)        
Accumulated other comprehensive income (loss), net of tax, total $ (23,999) $ (25,074) $ (23,999) $ (25,074) $ (26,423) $ (30,458) $ (7,778) $ (10,282)