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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-Based Compensation Plans [Abstract]

Company's Shareholder Approved Plans

						Weighted-
			Weighted-			Average
			Average			Remaining		Aggregate
(Aggregate Intrinsic Value in thousands)			Exercise			Contractual		Intrinsic
Options	Shares		Price/Share			Term		Value
Outstanding at January 1, 2020	170,704		$	87.18
Granted	-			-
Exercised	53,833			85.69
Forfeited/Cancelled/Expired	–			-
Outstanding at December 31, 2020	116,871			87.87		0.7		$	17,089
				.
Exercisable at December 31, 2020	116,871			87.87		0.7		$	17,089

						Weighted-
			Weighted-			Average
			Average			Remaining		Aggregate
(Aggregate Intrinsic Value in thousands)			Exercise			Contractual		Intrinsic
Options	Shares		Price/Share			Term		Value
Outstanding at January 1, 2019	279,164		$	83.84
Granted	-			-
Exercised	108,460			78.58
Forfeited/Cancelled/Expired	-			-
Outstanding at December 31, 2019	170,704			87.18		1.4		$	32,376
				.
Exercisable at December 31, 2019	170,704			87.18		1.4		$	32,376

						Weighted-
			Weighted-			Average
			Average			Remaining		Aggregate
(Aggregate Intrinsic Value in thousands)			Exercise			Contractual		Intrinsic
Options	Shares		Price/Share			Term		Value
Outstanding at January 1, 2018	360,364		$	84.10
Granted	-			-
Exercised	81,200			84.99
Forfeited/Cancelled/Expired	-			-
Outstanding at December 31, 2018	279,164			83.84		1.9		$	37,386
Exercisable at December 31, 2018	279,164			83.84		1.9		$	37,386

Share Options Outstanding And Exercisable

	At December 31, 2020
	Options Outstanding							Options Exercisable
			Weighted-
			Average		Weighted-					Weighted-
	Number		Remaining		Average			Number		Average
Range of	Outstanding		Contractual		Exercise			Exercisable		Exercise
Exercise Prices	at 12/31/20		Life		Price			at 12/31/20		Price
$86.62 - $88.31	44,000		0.2		$	86.62		44,000		$	86.62
$88.32 - $90.48	66,917		1.1			88.32		66,917			88.32
$90.49 - $110.13	5,954		0.5			91.99		5,954			91.99
	116,871		0.7			87.87		116,871			87.87

Summary Of Company's Non-Vested Shares And Changes

	Years Ended December 31,
	2020					2019					2018
			Weighted-					Weighted-					Weighted-
			Average					Average					Average
			Grant Date					Grant Date					Grant Date
Restricted (non-vested) Shares	Shares		Fair Value			Shares		Fair Value			Shares		Fair Value
Outstanding at January 1,	495,137		$	228.02		414,407		$	217.15		421,261		$	194.01
Granted	200,929			269.86		232,601			232.36		173,065			240.59
Vested	175,413			220.88		138,322			203.41		141,982			178.31
Forfeited	37,226			246.20		13,549			221.35		37,937			212.48
Outstanding at December 31,	483,427			246.60		495,137			228.02		414,407			217.15

Company's Non-Vested Performance Share Unit Awards

	Years Ended December 31,
	2020					2019					2018
			Weighted-					Weighted-					Weighted-
			Average					Average					Average
			Grant Date					Grant Date					Grant Date
Performance Share Unit Awards	Shares		Fair Value			Shares		Fair Value			Shares		Fair Value
Outstanding at January 1,	34,850		$	-		32,382		$	-		33,454		$	-
Granted	16,120			277.15		16,855			223.45		13,325			242.39
Increase/(Decrease) on vesting units due to performance	(2,227)			-		(3,455)			-		(267)			-
Vested	6,157			277.15		10,922			223.45		12,435			242.39
Forfeited	3,695			-		-			-		1,695			-
Outstanding at December 31,	38,891			-		34,850			-		32,382			-

X

- Definition

Tabular disclosure of share-based payment arrangement.

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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- Definition

Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement.

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