Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 980,517	$ 855,214
Less accumulated depreciation	(536,928)	(479,560)
Property and equipment, net	443,589	375,654
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,476	4,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,293	111
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	62,062	62,140
Capitalized software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	874,871	759,925
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 29,815	$ 29,038