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Assets and Liabilities Measured at Fair Value - Components by Hierarchy Level (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Fair value of assets	$ 175,420	$ 324,055
Liabilities:
Contingent consideration payable	24,605	25,825
Deferred compensation plan liability	4,388	4,078
Fair value of liabilities	28,993	29,903
Commercial paper
Assets:
Fair value of assets	127,957	217,095
Asset-backed securities
Assets:
Fair value of assets	20,549	9,438
Corporate debt securities
Assets:
Fair value of assets	12,141	39,513
U.S. government agency bonds
Assets:
Fair value of assets	10,009	53,582
Money market funds
Assets:
Fair value of assets	4,764	4,427
Level 2
Assets:
Fair value of assets	175,420	324,055
Liabilities:
Contingent consideration payable	0	0
Deferred compensation plan liability	4,388	4,078
Fair value of liabilities	4,388	4,078
Level 2 | Commercial paper
Assets:
Fair value of assets	127,957	217,095
Level 2 | Asset-backed securities
Assets:
Fair value of assets	20,549	9,438
Level 2 | Corporate debt securities
Assets:
Fair value of assets	12,141	39,513
Level 2 | U.S. government agency bonds
Assets:
Fair value of assets	10,009	53,582
Level 2 | Money market funds
Assets:
Fair value of assets	4,764	4,427
Level 3
Liabilities:
Contingent consideration payable	24,605	25,825
Deferred compensation plan liability	0	0
Fair value of liabilities	$ 24,605	$ 25,825

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