Stock-Based Compensation (Schedule Of Non-Vested Restricted Stock Units and Performance Stock Units) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted Stock Units (RSUs)
Number of Shares
Number of Shares, Non-vested, beginning balance	690,414
Number of Shares, Granted	247,131
Number of Shares, Vested	(228,113)
Number of Shares, Forfeited	(67,804)
Number of Shares, Non-vested, ending balance	641,628	690,414
Weighted Average Grant Date Fair Value
Weighted Average Fair Value, Non-vested, beginning balance (in dollars per share)	$ 85.77
Weighted Average Fair Value, Granted (in dollars per share)	120.77
Weighted Average Fair Value, Vested (in dollars per share)	69.45
Weighted Average Fair Value, Forfeited (in dollars per share)	97.87
Weighted Average Fair Value, Non-vested, ending balance (in dollars per share)	$ 103.77	$ 85.77
Performance Stock Units
Number of Shares
Number of Shares, Non-vested, beginning balance	250,369
Number of Shares, Granted	72,627
Number of Shares, Vested	(106,705)
Number of Shares, Forfeited	(19,370)
Number of Shares, Non-vested, ending balance	196,921	250,369
Weighted Average Grant Date Fair Value
Weighted Average Fair Value, Non-vested, beginning balance (in dollars per share)	$ 106.13
Weighted Average Fair Value, Granted (in dollars per share)	167.76	$ 147.98	$ 109.94
Weighted Average Fair Value, Vested (in dollars per share)	74.99
Weighted Average Fair Value, Forfeited (in dollars per share)	142.29
Weighted Average Fair Value, Non-vested, ending balance (in dollars per share)	$ 142.18	$ 106.13