Revenues and Business Information - Schedule of Geographical Distribution of Revenues and Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 746,534	$ 885,840	$ 684,615
Total assets	1,071,699	914,375
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	635,787	731,265	535,985
Total assets	934,654	756,053
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	78,842	95,844	111,088
Total assets	67,247	55,064
Rest of World
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	31,905	58,731	$ 37,542
Total assets	$ 69,798	$ 103,258