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Business Combinations (Details 2) - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 681,358,000 $ 713,527,000 $ 679,395,000 $ 664,922,000
2019 Acquisition        
Business Acquisition [Line Items]        
Gross Aggregate Consideration 56,800,000      
Debt Assumed 1,200,000      
Current Assets 15,800,000      
Property, Plant, and Equipment 16,700,000      
Goodwill 23,100,000      
Other Intangibles 6,700,000      
Deferred Charges and Other Assets 500,000      
Current Liabilities 5,900,000      
Deferred Credits and Other Liabilities $ 100,000