Goodwill and Other Intangible Assets (2021 Acquisitions) (Narrative) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) acquisition	Mar. 31, 2020 USD ($)	Dec. 31, 2020 acquisition
Business Acquisition [Line Items]
Business combinations, number of acquisitions | acquisition	2		5
Business combinations, cash, net of cash acquired	$ 88,646	$ 0
2021 Acquisitions
Business Acquisition [Line Items]
Business combinations, cash, net of cash acquired	$ 90,000