Goodwill and Intangible Assets, Net (Details 4) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Changes in the carrying amount of goodwill
Balance at the beginning of the period			$ 123,881
Acquisitions			556
Foreign exchange			(1,160)
Balance at the end of the period	$ 123,277	$ 125,228	123,277	$ 125,228
Changes in the carrying amount of intangible assets
Balance at the beginning of the period			32,587
Acquisitions			653
Amortization	(1,500)	(1,800)	(4,613)	(5,500)
Foreign exchange			(57)
Balance at the end of the period	$ 28,570	$ 34,782	$ 28,570	$ 34,782