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Changes in Accumulated Other Comprehensive Loss by Component (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]        
Foreign currency translation, Beginning balance $ (30,335) $ (12,410)    
Foreign currency translation, Other comprehensive loss before reclassifications 4,178 2,245    
Foreign currency translation, Amounts reclassified from accumulated other comprehensive loss          
Other comprehensive income (loss), Foreign currency transaction and translation adjustment, net of tax 4,178 2,245    
Foreign currency translation, Ending balance (26,157) (10,165)    
Unrealized gain (loss) on derivatives, Beginning balance (111) 2,140    
Unrealized gain (loss) on derivatives, Net other comprehensive loss, net of tax (354) 996    
Unrealized gain (loss) on derivatives, Amounts reclassified from accumulated other comprehensive loss 211 (737)    
Unrealized gain (loss) on derivatives, Net other comprehensive loss, net of tax (143) 259    
Unrealized gain (loss) on derivatives, Ending balance (254) 2,399    
Post employment benefit liability, Beginning balance (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)    
Total, Other comprehensive loss before reclassifications 3,824 3,241    
Total, Amounts reclassified from accumulated other comprehensive loss 211 (737)    
Other comprehensive income, net of tax 4,035 2,504    
Accumulated other comprehensive income (loss), net of tax, total $ (26,423) $ (7,778) $ (30,458) $ (10,282)