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Acquisitions Of Businesses (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 01, 2019 USD ($) Company | Dec. 31, 2021 USD ($) Company | Dec. 31, 2020 USD ($) Company | Dec. 31, 2019 USD ($) Company
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 890,268 | $ 851,783 | $ 1,063,911
Amortization periods |  | 7 years 6 months |  |
Number of businesses acquired | Company | 1 | 8 | 3 | 6
2021 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price |  | $ 131,200 |  |
Working capital acquired |  | 22,900 |  |
Other net liabilities |  | 600 |  |
Goodwill |  | 38,300 |  |
Identifiable intangible assets |  | $ 70,600 |  |
2020 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price |  |  | $ 50,300 |
Working capital acquired |  |  | 3,000 |
Other net liabilities |  |  | 3,900 |
Goodwill |  |  | 13,100 |
Identifiable intangible assets |  |  | $ 38,100 |
BKI [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, percentage acquired | 100.00% |  |  |
Purchase price | $ 220,300 |  |  |
Working capital acquired | 29,800 |  |  |
Other net assets | 4,900 |  |  |
Goodwill | 43,900 |  |  |
Identifiable intangible assets | $ 141,700 |  |  |
Amortization periods | 10 years 6 months |  |  |
2019 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price |  |  |  | $ 85,400
Working capital acquired |  |  |  | 25,300
Other net assets |  |  |  | 1,300
Goodwill |  |  |  | 29,200
Identifiable intangible assets |  |  |  | $ 29,600

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