Property and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property and Equipment [Abstract]
Property and equipment		$ 784,644	$ 787,534
Less: accumulated depreciation		(331,040)	(322,999)
Property and equipment, net		453,604	464,535
Depreciation expense		61,700	56,400	$ 58,300
Impairment charges		0	48,551	$ 0
Land [Member]
Property and Equipment [Abstract]
Property and equipment		44,532	35,709
Buildings [Member]
Property and Equipment [Abstract]
Property and equipment		273,264	295,748
Construction in Progress [Member]
Property and Equipment [Abstract]
Property and equipment	[1]	17,707	18,153
Furniture and Fixtures [Member]
Property and Equipment [Abstract]
Property and equipment		130,591	118,149
Computers and Equipment [Member]
Property and Equipment [Abstract]
Property and equipment		147,806	160,873
Leasehold Improvements [Member]
Property and Equipment [Abstract]
Property and equipment		160,623	147,604
Scanners [Member]
Property and Equipment [Abstract]
Property and equipment		8,040	8,986
Vehicles [Member]
Property and Equipment [Abstract]
Property and equipment		2,081	2,312
Internal-Use Software Development Costs [Member]
Property and Equipment [Abstract]
Property and equipment		$ 10,800	$ 8,700

[1] Construction in progress includes $10.8 million and $8.7 million as of December 31, 2019 and 2018, respectively, of eligible capitalized internal-use software development costs which will be reclassified to computers and equipment when placed into service.