Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of The Status Of Nonvested Share Awards) (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Nonvested Share Awards [Roll Forward]
Nonvested, share awards, beginning balance | shares	1,206,004
Granted, Shares | shares	331,889
Vested, Shares | shares	(341,152)
Forfeited, Shares | shares	(30,406)
Nonvested, share awards, ending balance | shares	1,166,335
Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 55.43
Granted, Weighted Average Grant Date Fair Value | $ / shares	59.11
Vested, Weighted Average Grant Date Fair Value | $ / shares	48.30
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	58.13
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 58.48