Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 1,033,782	$ 994,198
Less: accumulated depreciation	(336,067)	(278,386)
Total property and equipment, net	697,715	715,812
Capital leased assets, gross	106,800	85,600
Capital leases accumulated depreciation	30,400	13,100
Depreciation and amortization expense	60,000	62,300	$ 47,300
Buildings
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	531,627	531,642
Furniture and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	218,623	202,846
Software
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	124,469	113,875
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	106,768	99,942
Computers
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	52,295	45,893
Internal Use Software
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	(4,100)	(1,200)
Total property and equipment, net	$ 15,400	$ 11,200