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Goodwill and Identifiable Intangible Assets - Schedule of Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]    
Accumulated Amortization $ (293,072) $ (252,164)
Total 356,024  
Gross Carrying Amount, Trade names (unamortized) 183,239 174,039
Accumulated Impairment Charge, Trade names (unamortized) (51,865) (49,437)
Total, Trade names (unamortized) 131,374 124,602
Gross Carrying Amount, Total 837,169 779,269
Accumulated Impairment Charge, Total (56,699) (54,271)
Total 487,398 472,834
Contract backlog    
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 48,645 47,745
Accumulated Amortization (48,412) (47,745)
Accumulated Impairment Charge 0 0
Total 233 0
Developed technology/Vendor network    
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 95,661 95,661
Accumulated Amortization (45,616) (40,482)
Accumulated Impairment Charge 0 0
Total 50,045 55,179
Customer relationships    
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 466,556 430,356
Accumulated Amortization (173,156) (141,695)
Accumulated Impairment Charge (4,834) (4,834)
Total 288,566 283,827
Non-competition agreements    
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,220 10,220
Accumulated Amortization (10,041) (9,832)
Accumulated Impairment Charge 0 0
Total 179 388
Trade names (amortized)    
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 32,848 21,248
Accumulated Amortization (15,847) (12,410)
Accumulated Impairment Charge 0 0
Total $ 17,001 $ 8,838