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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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