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Business Combinations (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill $ 717,863,000 $ 714,963,000 $ 708,664,000 $ 681,358,000
2021 Acquisition        
Business Acquisition [Line Items]        
Gross Aggregate Consideration 13,800,000      
Cash Assumed 100,000      
Business Combination, Consideration Transferred 13,700,000      
Current Assets 700,000      
Property, Plant, and Equipment 13,000,000.0      
Goodwill 2,900,000      
Other Intangibles 600,000      
Current Liabilities 200,000      
Deferred Credits and Other Liabilities 100,000      
Deferred Tax Liabilities $ 3,200,000