Long-Lived Assets (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of carrying value of assets
Gross Carrying Amount, Client contracts	$ 130,573	$ 257,485
Client contracts, Accumulated Amortization	(75,382)	(182,182)
Client contracts, Net Amount	55,191	75,303
Gross Carrying Amount, Software	121,069	106,868
Software, Accumulated Amortization	(77,504)	(68,496)
Software, Net Amount	43,565	38,372
Investments in client contracts
Summary of carrying value of assets
Gross Carrying Amount, Client contracts	27,370	118,473
Client contracts, Accumulated Amortization	(20,345)	(112,225)
Client contracts, Net Amount	7,025	6,248
Capitalized costs
Summary of carrying value of assets
Gross Carrying Amount, Client contracts	5,003	16,288
Client contracts, Accumulated Amortization	(3,340)	(11,054)
Client contracts, Net Amount	1,663	5,234
Acquired client contracts
Summary of carrying value of assets
Gross Carrying Amount, Client contracts	98,200	122,724
Client contracts, Accumulated Amortization	(51,697)	(58,903)
Client contracts, Net Amount	46,503	63,821
Acquired software
Summary of carrying value of assets
Gross Carrying Amount, Software	67,975	67,088
Software, Accumulated Amortization	(53,820)	(51,724)
Software, Net Amount	14,155	15,364
Internal use software
Summary of carrying value of assets
Gross Carrying Amount, Software	53,094	39,780
Software, Accumulated Amortization	(23,684)	(16,772)
Software, Net Amount	$ 29,410	$ 23,008