Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property and Equipment
Total	$ 1,627,347	$ 1,390,329
Less accumulated depreciation and amortization	308,388	264,446
Property and equipment, net	1,318,959	1,125,883
Land [Member]
Property and Equipment
Total	482,600	400,163
Buildings [Member]
Property and Equipment
Total	$ 700,257	553,961
Buildings [Member] | Minimum [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives	25
Buildings [Member] | Maximum [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives	50
Leasehold improvements [Member]
Property and Equipment
Total	$ 172,071	170,060
Machinery and equipment [Member]
Property and Equipment
Total	$ 117,781	100,164
Machinery and equipment [Member] | Minimum [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives	7
Machinery and equipment [Member] | Maximum [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives	20
Furniture and fixtures [Member]
Property and Equipment
Total	$ 100,881	87,691
Furniture and fixtures [Member] | Minimum [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives	3
Furniture and fixtures [Member] | Maximum [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives	10
Company vehicles [Member]
Property and Equipment
Total	$ 11,933	11,632
Company vehicles [Member] | Minimum [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives	3
Company vehicles [Member] | Maximum [Member]
Property and Equipment
Property, Plant and Equipment, Estimated Useful Lives	5
Construction in progress [Member]
Property and Equipment
Total	$ 41,824	$ 66,658