Stock Incentive Plan (Schedule of Share-based Compensation, Unearned Compensation Related to RSU's) (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Changes In Unearned Compensation [Roll Forward]
Unearned compensation at beginning of year	$ 135,535	$ 132,310	$ 128,390
RSUs granted, net of cancellations	60,628	56,711	54,270
RSUs expensed	47,611	(46,441)	(47,108)
RSUs forfeitures	6,492	(7,045)	(3,242)
Unearned compensation at end of year	$ 142,060	$ 135,535	$ 132,310