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Significant Accounting Policies (Summary of Activity Related to Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Line Items]        
Balance at beginning of period $ 22,360    
Cumulative effect 3,239,354 1,131,424 $ 3,285,447 $ 1,132,487
Acquisitions and Dispositions (1,654)    
Provisions 10,381    
Write-offs (2,330)    
Balance at end of period 29,174    
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]        
Accounts Receivable, Allowance for Credit Loss [Line Items]        
Cumulative effect $ 417 $ (417)