Reportable Segments and Geographic Information (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 580,150	$ 535,103	$ 1,269,402	$ 953,996
Long-lived assets	591,265		591,265		$ 587,397
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	534,110	477,769	1,175,034	843,110
Long-lived assets	570,921		570,921		566,028
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	43,369	41,473	89,725	95,025
Long-lived assets	19,734		19,734		20,689
Other Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	2,671	15,861	4,643	15,861
Long-lived assets	610		610		$ 680
Non-United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 46,040	$ 57,334	$ 94,368	$ 110,886