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Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Liabilities, Fair Value Disclosure [Abstract]
Accruals and other current liabilities	$ 2,884	$ 5,100
Fair Value, Recurring
Assets, Fair Value Disclosure [Abstract]
Total assets	35,043	70,000
Liabilities, Fair Value Disclosure [Abstract]
Acquisition contingent consideration	4,299	6,599
Deferred compensation plan	2,591	2,544
Cash-settled equity awards	195
Total liabilities	7,085	9,143
Accruals and other current liabilities	2,884	5,100
Deferred compensation plan, current	169	153
Fair Value, Recurring | Money Market Funds
Assets, Fair Value Disclosure [Abstract]
Money market funds	34,696	70,000
Fair Value, Recurring | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Interest rate swap	347
Level 1 | Fair Value, Recurring
Assets, Fair Value Disclosure [Abstract]
Total assets	34,696	70,000
Liabilities, Fair Value Disclosure [Abstract]
Acquisition contingent consideration	0	0
Deferred compensation plan	2,591	2,544
Cash-settled equity awards	195
Total liabilities	2,786	2,544
Level 1 | Fair Value, Recurring | Money Market Funds
Assets, Fair Value Disclosure [Abstract]
Money market funds	34,696	70,000
Level 1 | Fair Value, Recurring | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Interest rate swap	0
Level 2 | Fair Value, Recurring
Assets, Fair Value Disclosure [Abstract]
Total assets	347	0
Liabilities, Fair Value Disclosure [Abstract]
Acquisition contingent consideration	0	0
Deferred compensation plan	0	0
Cash-settled equity awards	0
Total liabilities	0	0
Level 2 | Fair Value, Recurring | Money Market Funds
Assets, Fair Value Disclosure [Abstract]
Money market funds	0	0
Level 2 | Fair Value, Recurring | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Interest rate swap	347
Level 3 | Fair Value, Recurring
Assets, Fair Value Disclosure [Abstract]
Total assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Acquisition contingent consideration	4,299	6,599
Deferred compensation plan	0	0
Cash-settled equity awards	0
Total liabilities	4,299	6,599
Level 3 | Fair Value, Recurring | Money Market Funds
Assets, Fair Value Disclosure [Abstract]
Money market funds	0	$ 0
Level 3 | Fair Value, Recurring | Interest Rate Swap
Assets, Fair Value Disclosure [Abstract]
Interest rate swap	$ 0

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Amount of liability recognized arising from contingent consideration in a business combination.

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