Goodwill and Intangible Assets, Net, Carrying Amount of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill
Balance at the beginning of the period			$ 130,250
Amortization			1,815
Foreign exchange			247
Balance at the end of the period	$ 132,312	$ 136,398	132,312	$ 136,398
Intangible Assets
Balance at the beginning of the period			24,402
Finite-lived Intangible Assets Acquired			1,213
Amortization	(1,300)	(1,300)	(2,657)	(2,600)
Foreign exchange			33
Balance at the end of the period	$ 22,991	$ 26,761	$ 22,991	$ 26,761