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Goodwill and Intangible Assets, Net (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Changes in the carrying amount of goodwill        
Balance at the beginning of the period     $ 99,849  
Acquisitions     29,607  
Foreign exchange     (644)  
Balance at the end of the period 128,812 69,688 128,812 69,688
Changes in the carrying amount of intangible assets        
Balance at the beginning of the period     27,856  
Acquisitions 17,672   17,672  
Amortization (1,700) (1,000) (5,438) (3,200)
Foreign exchange     (15)  
Balance at the end of the period $ 40,075 $ 20,252 $ 40,075 $ 20,252