Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Segment	Sep. 30, 2016 USD ($)	Dec. 31, 2015 Segment
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			1		2
Revenues	$ 306,699	$ 179,415	$ 869,557	$ 757,874
United States
Segment Reporting Information [Line Items]
Revenues	154,815	165,933	498,744	502,776
International
Segment Reporting Information [Line Items]
Revenues	151,884	13,482	370,813	255,098
Europe
Segment Reporting Information [Line Items]
Revenues	127,687	(9,540)	300,379	188,223
Other foreign countries
Segment Reporting Information [Line Items]
Revenues	$ 24,197	$ 23,022	$ 70,434	$ 66,875