Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Schedule of nonvested restricted stock and deferred shares activity and related information

	Year Ended December 31,
	2023			2022			2021
		Weighted			Weighted			Weighted
		Average			Average			Average
		Grant Date			Grant Date			Grant Date
	Shares	Fair Value		Shares	Fair Value		Shares	Fair Value
	(Shares in thousands)
Unvested at beginning of year	121	$	121.39	138	$	97.43	166	$	77.97
Granted	51		167.39	64		143.86	61		128.32
Vested	(76)		112.65	(78)		94.33	(84)		81.70
Cancelled/Forfeitures	(3)		139.46	(3)		120.31	(5)		93.98
Unvested at end of year	93	$	149.96	121	$	121.39	138	$	97.43

Schedule of stock-based compensation fair value assumptions

	2023		2022
Expected life (years)	3.0		3.0
Expected stock price volatility	33.7	%	33.7	%
Expected dividend yield	0.80	%	0.80	%
Risk-free interest rate	4.1	%	2.0	%

Schedule of stock option activity and related information

	Year Ended December 31,
	2023					2022					2021
		Weighted		Weighted			Weighted			Weighted		Weighted			Weighted
		Average		Average			Average			Average		Average			Average
		Exercise		Intrinsic			Exercise			Intrinsic		Exercise			Intrinsic
	Options	Price		Value		Options	Price			Value	Options	Price			Value
	(Options in thousands)
Outstanding at beginning of year	1	$	57.47			4	$	52.92			5	$	52.40
Cancelled/Forfeitures	—		—			—		—			—		—
Exercised	(1)		57.47			(3)		51.36			(1)		51.04
Outstanding at end of year	—	$	57.47	$	150.87	1	$	57.47	$	88.76	4	$	52.92	$	141.25
Exercisable at end of year	—	$	57.47	$	150.87	1	$	57.47	$	88.76	4	$	52.92	$	141.25

Schedule of the Company's RSU activity and related information

	Year Ended December 31,
	2023					2022			2021
		Weighted			Weighted		Weighted			Weighted
		Average			Average		Average			Average
		Purchase			Intrinsic		Purchase			Purchase
	RSUs	Price			Value	RSUs	Price		RSUs	Price
	(RSUs in thousands)
Outstanding at beginning of year	77	$	94.78			85	$	75.34	95	$	64.54
Granted	26		130.27			29		115.14	25		97.98
Settled	(25)		66.94			(35)		64.15	(34)		61.38
Cancelled/Forfeitures	(1)		124.04			(2)		92.09	(1)		77.03
Outstanding at end of year	77	$	114.93	$	—	77	$	94.78	85	$	75.34
Vested at end of year	23	$	104.17	$	—	24	$	77.69	31	$	65.29

Restricted stock and deferred shares

Schedule of information about RSUs outstanding

The following table summarizes information about RSUs outstanding at December 31, 2023:

	RSUs Outstanding			RSUs Vested
		Weighted Average			Weighted Average
	Number	Purchase		Number	Purchase
Range of Purchase Prices	Outstanding	Price		Vested	Price
	(RSUs in thousands)
$69.76-$97.28	23	$	97.28	14	$	97.28
$97.29-$115.14	28		115.14	9		115.14
$115.15-$130.27	26		130.27	—		—
	77	$	114.93	23	$	104.17

Performance stock units

Schedule of unvested performance shares activity and related information

	Year Ended December 31,
	2023			2022			2021
		Weighted			Weighted			Weighted
		Average			Average			Average
		Grant Date			Grant Date			Grant Date
	Shares	Fair Value		Shares	Fair Value		Shares	Fair Value
	(Shares in thousands)
Unvested at beginning of year	146	$	107.29	178	$	88.32	208	$	78.06
Granted	99		106.37	108		102.98	61		113.37
Vested	(125)		73.62	(136)		78.82	(85)		81.50
Cancelled/Forfeitures	(7)		132.14	(4)		110.43	(6)		83.53
Unvested at end of year	113	$	142.53	146	$	107.29	178	$	88.32