Long-Lived Assets - Summary of Carrying Value of Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Summary of carrying value of assets
Gross Carrying Amount	$ 259,863	$ 257,817
Accumulated Amortization	(190,478)	(182,984)
Net Amount	69,385	74,833
Client contracts
Summary of carrying value of assets
Gross Carrying Amount	129,027	127,628
Accumulated Amortization	(91,447)	(87,890)
Net Amount	37,580	39,738
Software
Summary of carrying value of assets
Gross Carrying Amount	130,836	130,189
Accumulated Amortization	(99,031)	(95,094)
Net Amount	$ 31,805	$ 35,095