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Business Combinations - Narrative (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 09, 2021 USD ($) | Oct. 01, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 616,387 | $ 616,387 |  | $ 499,309
Goodwill, purchase accounting adjustments |  |  | 849 |  |  |
FDS Amplicare |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Base purchase price | $ 177,000 |  |  |  |  |
Goodwill | 118,846 |  |  |  |  |
Acquisition related costs |  |  | 4,600 | $ 6,600 |  |
Business combination, consideration transferred | $ 178,545 |  |  |  |  |
FDS Amplicare | Discount Rate |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Measurement input used in estimating the fair values of intangible assets |  | 0.130 |  |  |  |
FDS Amplicare | Acquired Technology | Royalty Rate |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Measurement input used in estimating the fair values of intangible assets |  | 0.100 |  |  |  |
FDS Amplicare | Trade Names | Royalty Rate |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Measurement input used in estimating the fair values of intangible assets |  | 0.020 |  |  |  |
340B Link Business |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  | $ 160,268 |  |  |  |
Acquisition related costs |  |  |  |  | $ 3,900 |
Business combination, consideration transferred |  | 225,000 |  |  |  |
Goodwill, purchase accounting adjustments |  |  | 900 |  |  |
Increase in other current assets, adjustment |  |  | 300 |  |  |
Decrease in accrued liabilities, adjustment |  |  | 100 |  |  |
Decrease in noncurrent deferred tax liability, adjustment |  |  | $ 500 |  |  |
Goodwill expected to be deductible for tax purposes |  | $ 93,700 |  |  |  |
340B Link Business | Discount Rate |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Measurement input used in estimating the fair values of intangible assets |  | 0.140 |  |  |  |
340B Link Business | Acquired Technology | Royalty Rate |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Measurement input used in estimating the fair values of intangible assets |  | 0.100 |  |  |  |
340B Link Business | Trade Names | Royalty Rate |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Measurement input used in estimating the fair values of intangible assets |  | 0.005 |  |  |  |

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