Goodwill and Intangible Assets, Net, Carrying Amount of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill
Balance at the beginning of the period			$ 130,250
Amortization			1,815
Foreign exchange			(504)
Balance at the end of the period	$ 131,191	$ 136,459	131,191	$ 136,459
Intangible Assets
Balance at the beginning of the period			24,402
Finite-lived Intangible Assets Acquired			1,213
Amortization	(1,400)	(1,400)	(4,065)	(4,000)
Foreign exchange			(215)
Balance at the end of the period	$ 21,816	$ 25,457	21,816	$ 25,457
Goodwill, Other Increase (Decrease)			(370)
Finite Lived Intangible Assets Reclassifications			$ 481