Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment Net By Type [Abstract]
Property and equipment, gross	$ 2,752,111	$ 2,493,580
Less accumulated depreciation and amortization	(673,988)	(596,339)
Property and equipment, net	$ 2,078,123	1,897,241	$ 1,916,386
Minimum
Property Plant And Equipment Net By Type [Abstract]
Useful life	1 year
Land
Property Plant And Equipment Net By Type [Abstract]
Property and equipment, gross	$ 129,421	116,517
Buildings and improvements
Property Plant And Equipment Net By Type [Abstract]
Property and equipment, gross	$ 2,009,279	1,853,409
Buildings and improvements | Minimum
Property Plant And Equipment Net By Type [Abstract]
Useful life	2 years
Buildings and improvements | Maximum
Property Plant And Equipment Net By Type [Abstract]
Useful life	50 years
Leasehold improvements
Property Plant And Equipment Net By Type [Abstract]
Property and equipment, gross	$ 288,614	270,760
Leasehold improvements | Minimum
Property Plant And Equipment Net By Type [Abstract]
Useful life	1 year
Leasehold improvements | Maximum
Property Plant And Equipment Net By Type [Abstract]
Useful life	29 years
Equipment
Property Plant And Equipment Net By Type [Abstract]
Property and equipment, gross	$ 193,281	186,095
Equipment | Minimum
Property Plant And Equipment Net By Type [Abstract]
Useful life	3 years
Equipment | Maximum
Property Plant And Equipment Net By Type [Abstract]
Useful life	10 years
Furniture, fixtures and computer software
Property Plant And Equipment Net By Type [Abstract]
Property and equipment, gross	$ 57,204	52,225
Furniture, fixtures and computer software | Maximum
Property Plant And Equipment Net By Type [Abstract]
Useful life	7 years
Facility construction in progress
Property Plant And Equipment Net By Type [Abstract]
Property and equipment, gross	$ 74,312	$ 14,574