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Acquisitions - Schedules of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 05, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Cash consideration, net of $125,865 in cash and restricted cash acquired |  | $ 571,552 | $ 0 |
Less: |  |  |  |
Recorded goodwill |  | 2,325,942 |  | $ 1,832,129
Weighted average life (in years) | 7 years |  |  |
Discovery Benefits |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration, net of $125,865 in cash and restricted cash acquired | $ 249,781 |  |  |
Fair value of redeemable non-controlling interest | 100,000 |  |  |
Deferred cash consideration | 50,000 |  |  |
Restricted cash |  | 125,865 |  |
Less: |  |  |  |
Accounts receivable | 10,722 |  |  |
Other assets | 13,601 |  |  |
Accounts payable | (3,071) |  |  |
Accrued expenses | (7,563) |  |  |
Restricted cash payable | (125,346) |  |  |
Deferred income taxes | (22,200) |  |  |
Other liabilities | (9,814) |  |  |
Recorded goodwill | $ 272,248 |  |  |
Noventis |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total consideration |  | 293,767 |  |
Restricted cash |  | 44,947 |  |
Less: |  |  |  |
Accounts receivable |  | 22,134 |  |
Property and equipment |  | 549 |  |
Other assets |  | 2,379 |  |
Accounts payable |  | (33,521) |  |
Deferred income taxes |  | (24,121) |  |
Other liabilities |  | (2,367) |  |
Recorded goodwill |  | $ 212,814 |  |
Weighted average life (in years) |  | 7 years 7 months 6 days |  |
Customer relationships |  |  |  |
Less: |  |  |  |
Weighted average life (in years) | 7 years 3 months 18 days |  |  |
Customer relationships | Discovery Benefits |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total consideration | $ 399,781 |  |  |
Less: |  |  |  |
Property and equipment | 4,904 |  |  |
Intangible assets | $ 213,600 |  |  |
Customer relationships | Noventis |  |  |  |
Less: |  |  |  |
Intangible assets |  | $ 100,900 |  |
Weighted average life (in years) |  | 8 years 3 months 18 days |  |
Developed technologies |  |  |  |
Less: |  |  |  |
Weighted average life (in years) | 5 years 4 months 24 days |  |  |
Developed technologies | Discovery Benefits |  |  |  |
Less: |  |  |  |
Intangible assets | $ 38,900 |  |  |
Developed technologies | Noventis |  |  |  |
Less: |  |  |  |
Intangible assets |  | $ 15,000 |  |
Weighted average life (in years) |  | 2 years 10 months 24 days |  |
Trademarks and trade names |  |  |  |
Less: |  |  |  |
Weighted average life (in years) | 7 years 3 months 18 days |  |  |
Trademarks and trade names | Discovery Benefits |  |  |  |
Less: |  |  |  |
Intangible assets | $ 13,800 |  |  |

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