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Business Combinations - Additional Information (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) business | Mar. 31, 2020 USD ($) business
Business Acquisition [Line Items] |  |
Number of businesses acquired | business | 1 | 2
Acquisition-related costs | $ 1,200 | $ 700
Amortization | 8,396 | 6,680
Income tax expense | 6,150 | 5,684
Combined Business Acquisitions |  |
Business Acquisition [Line Items] |  |
Amortization | 400 | 2,500
Income tax expense | $ 400 | $ 600

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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