Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Gross property and equipment	$ 160,190	$ 158,582
Less: Accumulated depreciation	(42,472)	(27,251)
Property and equipment, net	117,718	131,331
Building
Property Plant And Equipment [Line Items]
Gross property and equipment	71,780	71,780
Computer Equipment
Property Plant And Equipment [Line Items]
Gross property and equipment	21,448	22,225
Leasehold Improvements
Property Plant And Equipment [Line Items]
Gross property and equipment	56,396	54,004
Furniture, Fixtures, and Other Assets
Property Plant And Equipment [Line Items]
Gross property and equipment	$ 10,566	$ 10,573