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Business Combinations - Assets Acquired & Liabilities Assumed (Details 2) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 681,358,000 $ 714,963,000 $ 664,922,000
2019 Acquisition      
Business Acquisition [Line Items]      
Gross Aggregate Consideration 56,800,000    
Business Combination, Long-Term Debt Assumed 1,200,000    
Business Combination, Current Assets 15,800,000    
Business Combination, Property, Plant, and Equipment 16,700,000    
Goodwill 23,100,000    
Business Combination, Other Intangible Assets 6,700,000    
Deferred charges and other assets - other 500,000    
Business Combination, Current Liabilities 5,900,000    
Business Combination, Noncurrent Liabilities $ 100,000