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Goodwill and Intangible Assets, Net (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Changes in the carrying amount of goodwill    
Balance at the beginning of the period $ 121,981  
Acquisitions 2,606  
Reclassifications (696)  
Foreign exchange (1,309)  
Balance at the end of the period 122,582 130,556
Changes in the carrying amount of intangible assets    
Balance at the beginning of the period 50,598  
Acquisitions 1,869  
Reclassifications (4,369)  
Amortization (1,991) (1,900)
Foreign exchange (829)  
Balance at the end of the period $ 45,278 $ 43,484