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Shareholders' Equity (Details 6) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated other comprehensive loss      
Balance at the beginning of the period $ (16,018)    
Other comprehensive loss (13,301) (9,494) (11,277)
Balance at the end of the period (29,319) (16,018)  
Foreign Currency Translation Adjustments
     
Accumulated other comprehensive loss      
Balance at the beginning of the period (16,130)    
Other comprehensive loss (13,189)    
Balance at the end of the period (29,319)    
Cash Flow Hedges
     
Accumulated other comprehensive loss      
Balance at the beginning of the period 112    
Other comprehensive loss $ (112)