Significant Accounting Policies (Summary of Activity Related to Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of period	$ 24,126	$ 22,360
Acquisitions and Dispositions		(1,654)
Provisions	1,477	10,381
Write-offs	(2,523)	(2,330)
Balance at end of period	$ 23,080	29,174
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of period		$ 417