Long-Lived Assets - Summary of Carrying Value of Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Summary of carrying value of assets
Gross Carrying Amount	$ 261,533	$ 257,817
Accumulated Amortization	(195,473)	(182,984)
Net Amount	66,060	74,833
Client contracts
Summary of carrying value of assets
Gross Carrying Amount	129,992	127,628
Accumulated Amortization	(94,297)	(87,890)
Net Amount	35,695	39,738
Software
Summary of carrying value of assets
Gross Carrying Amount	131,541	130,189
Accumulated Amortization	(101,176)	(95,094)
Net Amount	$ 30,365	$ 35,095