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Goodwill and Identifiable Intangible Assets - Schedule of Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (421,238) | $ (373,096)
Total | 412,237 |
Gross Carrying Amount, Trade names (unamortized) | 251,440 | 209,840
Accumulated Impairment Charge, Trade names (unamortized) | (52,233) | (52,233)
Total, Trade names (unamortized) | 199,207 | 157,607
Gross Carrying Amount, Total | 1,089,749 | 918,449
Accumulated Impairment Charge, Total | (57,067) | (57,067)
Total | 611,444 | 488,286
Contract backlog |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 66,745 | 58,945
Accumulated Amortization | (61,651) | (56,812)
Accumulated Impairment Charge | 0 | 0
Total | 5,094 | 2,133
Developed technology/Vendor network |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 95,661 | 95,661
Accumulated Amortization | (60,156) | (55,318)
Accumulated Impairment Charge | 0 | 0
Total | 35,505 | 40,343
Customer relationships |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 644,755 | 522,855
Accumulated Amortization | (277,601) | (240,073)
Accumulated Impairment Charge | (4,834) | (4,834)
Total | 362,320 | 277,948
Trade names (amortized) |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 31,148 | 31,148
Accumulated Amortization | (21,830) | (20,893)
Accumulated Impairment Charge | 0 | 0
Total | $ 9,318 | $ 10,255

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