Property and Equipment, Net (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 669,630,000		$ 669,630,000		$ 622,998,000
Less: accumulated depreciation	(475,655,000)		(475,655,000)		(436,381,000)
Property and equipment, net	193,975,000		193,975,000		186,617,000
Depreciation and amortization	13,000,000	19,000,000	50,500,000	52,500,000
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	10,780,000		10,780,000		10,780,000
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	94,666,000		94,666,000		89,870,000
Capitalized software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	511,763,000		511,763,000		470,469,000
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 48,421,000		$ 48,421,000		$ 47,879,000