Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

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

	Year Ended December 31,
	2020			2019			2018
		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	196	$	76.56	216	$	71.28	217	$	57.31
Granted	92		75.77	96		78.54	153		80.52
Vested	(100)		74.84	(102)		68.83	(126)		59.52
Cancelled/Forfeitures	(22)		75.73	(14)		56.97	(28)		66.24
Unvested at end of year	166	$	77.97	196	$	76.56	216	$	71.28

Schedule of stock-based compensation fair value assumptions

	2020		2019
Expected life (years)	3.0		3.0
Expected stock price volatility	24.6	%	23.3	%
Expected dividend yield	1.1	%	1.1	%
Risk-free interest rate	0.6	%	2.5	%

Schedule of stock option activity and related information

	Year Ended December 31,
	2020					2019			2018
		Weighted		Weighted			Weighted			Weighted
		Average		Average			Average			Average
		Exercise		Intrinsic			Exercise			Exercise
	Options	Price		Value		Options	Price		Options	Price
	(Options in thousands)
Outstanding at beginning of year	10	$	53.65			49	$	55.25	95	$	54.91
Cancelled/Forfeitures	—		—			(1)		57.47	—		—
Exercised	(5)		55.03			(38)		55.63	(46)		54.55
Outstanding at end of year	5	$	52.40	$	69.30	10	$	53.65	49	$	55.25
Exercisable at end of year	5	$	52.40	$	69.30	10	$	53.65	49	$	55.25

Schedule of information about options outstanding

The following table summarizes information about options outstanding at December 31, 2020:

	Options Outstanding				Options Exercisable
		Weighted Average	Weighted Average			Weighted Average
	Number	Remaining Contractual	Exercise		Number	Exercise
Range of Exercise Prices	Outstanding	Life (years)	Price		Exercisable	Price
	(Options in thousands)
$37.41-$54.76	3	2.29	$	49.53	3	$	49.53
$57.47–$57.47	2	3.58		57.47	2		57.47
	5	2.76	$	52.40	5	$	52.40

Schedule of the Company's RSU activity and related information

	Year Ended December 31,
	2020					2019				2018
		Weighted			Weighted			Weighted			Weighted
		Average			Average			Average			Average
		Purchase			Intrinsic			Purchase			Purchase
	RSUs	Price			Value	RSUs		Price		RSUs	Price
	(RSU’s in thousands)
Outstanding at beginning of year	110	$	57.91				154	$	45.02	174	$	39.68
Granted	28		69.76				37		63.77	36		61.84
Settled	(40)		49.76				(79)		35.63	(46)		37.34
Cancelled/Forfeitures	(3)		65.69				(2)		56.25	(10)		48.82
Outstanding at end of year	95	$	64.54	$	57.16	$	110	$	57.91	154	$	45.02
Vested at end of year	32	$	61.89	$	59.81	$	35	$	52.67	66	$	38.17

Restricted stock and deferred shares

Schedule of information about RSUs outstanding

The following table summarizes information about RSUs outstanding at December 31, 2020:

	RSUs Outstanding			RSUs Vested
		Weighted Average			Weighted Average
	Number	Purchase		Number	Purchase
Range of Purchase Prices	Outstanding	Price		Vested	Price
	(RSUs in thousands)
$35.41-$49.92	1	$	40.69	1	$	40.69
$61.84-$69.76	94		64.80	31		62.56
	95	$	64.54	32	$	61.89

Performance stock units

Schedule of unvested performance shares activity and related information

	Year Ended December 31,
	2020			2019			2018
		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	238	$	73.84	249	$	66.15	273	$	58.23
Granted	94		70.65	88		77.58	96		81.51
Vested	(97)		60.45	(82)		55.27	(80)		58.96
Cancelled/Forfeitures	(27)		78.59	(17)		71.50	(40)		63.43
Unvested at end of year	208	$	78.06	238	$	73.84	249	$	66.15