Income Taxes (Schedule of Components of Provision (Benefit) for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal	$ 72,921	$ 52,194	$ 47,130
State	17,346	11,967	10,415
International	26,301	24,239	22,015
Provision for current income taxes	116,568	88,400	79,560
Deferred
Federal	(14,126)	4,826	3,970
State	(2,863)	269	(937)
International	(19,725)	931	(1,898)
Provision (benefit) for deferred income taxes	(36,714)	6,026	1,135
Provision for income taxes	$ 79,854	$ 94,426	$ 80,695