Long-Lived Assets - Summary of Carrying Value of Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Summary of carrying value of assets
Gross Carrying Amount	$ 258,302	$ 257,817
Accumulated Amortization	(187,573)	(182,984)
Net Amount	70,729	74,833
Client contracts
Summary of carrying value of assets
Gross Carrying Amount	127,918	127,628
Accumulated Amortization	(90,402)	(87,890)
Net Amount	37,516	39,738
Software
Summary of carrying value of assets
Gross Carrying Amount	130,384	130,189
Accumulated Amortization	(97,171)	(95,094)
Net Amount	$ 33,213	$ 35,095