Goodwill and Other Intangible Assets (Schedule of Changes in Carrying Amounts of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Beginning Balance	$ 914,520	$ 883,158
Goodwill, Acquired During Period	226,232	33,709
Goodwill, Written off Related to Sale of Business Unit		(7,692)
Goodwill, Other Increase (Decrease)		744
Foreign currency translation adjustment and other	(9,631)	4,601
Ending Balance	1,131,121	914,520
Domestic Segment [Member]
Goodwill [Roll Forward]
Beginning Balance	854,188	819,735
Goodwill, Acquired During Period	119,709	33,709
Goodwill, Written off Related to Sale of Business Unit		0
Goodwill, Other Increase (Decrease)		744
Foreign currency translation adjustment and other	0	0
Ending Balance	973,897	854,188
International Segment [Member]
Goodwill [Roll Forward]
Beginning Balance	60,332	63,423
Goodwill, Acquired During Period	106,523	0
Goodwill, Written off Related to Sale of Business Unit		(7,692)
Goodwill, Other Increase (Decrease)		0
Foreign currency translation adjustment and other	(9,631)	4,601
Ending Balance	$ 157,224	$ 60,332