Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,031,667		$ 1,031,667		$ 1,029,441
Less accumulated depreciation	(585,610)		(585,610)		(572,944)
Property and equipment, net	446,057		446,057		456,497
Depreciation expense	22,100	$ 22,600	68,000	$ 66,800
Impairment losses	100		12,312	$ 100
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,476		7,476		7,476
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,487		6,487		6,487
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	71,993		71,993		68,851
Capitalized software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	897,990		897,990		902,482
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	44,424		44,424		43,476
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,297		$ 3,297		$ 669