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Acquisitions (Narrative) (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
entity
Dec. 31, 2021
USD ($)
agreement
Dec. 31, 2020
USD ($)
entity
Dec. 31, 2019
USD ($)
agreement
entity
Business Acquisition [Line Items]            
Cash consideration, net of cash acquired   $ 960,449,000     $ 388,789,000 $ 736,610,000
Contingent considerations $ 31,616,000 31,616,000 $ 31,616,000 $ 31,616,000   14,038,000
Increase in contingent consideration   2,954,000     18,418,000 $ 1,498,000
Number of businesses acquired with contingent consideration | agreement       9   5
Acquisition related costs   11,318,000     9,803,000 $ 12,335,000
Payment of contingent consideration recorded at acquisition date   12,934,000     $ 12,566,000 $ 3,200,000
Number of individual businesses acquired in period | entity     30   21 21
Revenues   6,151,361,000     $ 5,445,990,000 $ 5,388,679,000
Income before income tax provision   770,742,000     253,914,000 705,891,000
Impairments and other operating items   32,316,000     466,718,000 61,948,000
Goodwill expected to be deductible for tax purposes 187,287,000 187,287,000 $ 187,287,000 $ 187,287,000 169,147,000 266,310,000
Trade receivables acquired in business combination gross contractual amount 36,645,000 36,645,000 36,645,000 36,645,000 13,854,000 27,297,000
Trade receivables acquired In business combination expected to be uncollectible amount $ 3,409,000 $ 3,409,000 $ 3,409,000 $ 3,409,000 95,000 $ 2,077,000
Fair value of acquired working capital is provisional     19 19    
Measurement Input, Discount Rate [Member]            
Business Acquisition [Line Items]            
Contingent consideration measurement input 1.5 1.5 1.5 1.5   2.3
Maximum [Member]            
Business Acquisition [Line Items]            
Contingent consideration payable period 2 years         4 years
Minimum [Member]            
Business Acquisition [Line Items]            
Contingent consideration payable period 1 year         1 year
Other Acquisition [Member]            
Business Acquisition [Line Items]            
Increase in contingent consideration         3,327,000  
Debt [Member]            
Business Acquisition [Line Items]            
Liabilities incurred   $ 108,345,000     $ 91,349,000 $ 95,809,000