Property and Equipment, Net (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 835,533,000		$ 835,533,000		$ 635,237,000
Less: accumulated depreciation	(462,687,000)		(462,687,000)		(439,592,000)
Property and equipment, net	372,846,000		372,846,000		195,645,000
Depreciation and amortization	17,100,000	18,000,000	30,900,000	36,300,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,000,000		4,000,000		4,000,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,010,000		11,010,000		10,780,000
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	100,707,000		100,707,000		88,794,000
Capitalized software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	668,737,000		668,737,000		481,662,000
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 51,079,000		$ 51,079,000		$ 50,001,000