Goodwill and Intangible Assets, Net (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Changes in the carrying amount of goodwill
Balance at the beginning of the period			$ 123,881
Acquisitions			556
Foreign exchange			390
Balance at the end of the period	$ 124,827	$ 129,231	124,827	$ 129,231
Changes in the carrying amount of intangible assets
Balance at the beginning of the period			32,587
Acquisitions			653
Amortization	(1,500)	(1,500)	(3,096)	(3,700)
Foreign exchange			599
Balance at the end of the period	$ 30,743	$ 38,056	$ 30,743	$ 38,056