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Goodwill and Intangible Assets, Net (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Changes in the carrying amount of goodwill    
Goodwill at the beginning of the period, net $ 129,218  
Foreign exchange 215  
Goodwill at the end of the period, net 129,433 122,582
Changes in the carrying amount of intangible assets    
Balance at the beginning of the period 41,773  
Amortization (2,170) (2,000)
Foreign exchange 125  
Balance at the end of the period $ 39,728 $ 50,636