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Long-Lived Assets - Summary of Carrying Value of Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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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

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