Stock Compensation Plans and Other Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

A summary of the Plans’ stock option activity for the years ended December 31, 2020, 2019 and 2018 is as follows:


Stock Options	Common Shares	Weighted Average Strike Price		Remaining Contractual Term(1)	Intrinsic Value(2) ($000)
Outstanding at January 1, 2018	1,084,756	$	41.98
Granted	—	—

Exercised	(282,614)	41.25
Forfeited or canceled	(7,128)	39.84
Outstanding at December 31, 2018	795,014	$	42.25	3.1	$	19,268
Exercisable at December 31, 2018	613,932	$	42.54	3.1	$	14,705
Outstanding at January 1, 2019	795,014	$	42.25
Granted	—	—
Options outstanding in acquired plans	106,748	38.83
Exercised	(146,430)	38.84
Forfeited or canceled	—	—
Outstanding at December 31, 2019	755,332	$	42.43	2.8	$	21,503
Exercisable at December 31, 2019	735,396	$	42.42	2.7	$	20,947
Outstanding at January 1, 2020	755,332	$	42.43
Granted	—	—

Exercised	(229,061)	42.29
Forfeited or canceled	(5,608)	44.34
Outstanding at December 31, 2020	520,663	$	42.47	1.9	$	9,694
Exercisable at December 31, 2020	512,762	$	42.46	1.8	$	9,555
Vested or expected to vest at December 31, 2020	520,663	$	42.47	1.9	$	9,694

(1)Represents the weighted average contractual remaining life in years.

(2)Aggregate intrinsic value represents the total pretax intrinsic value (i.e., the difference between the Company’s stock price at year end and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the year. Options with exercise prices above the year end stock price are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company’s stock.

Summary of Plans' Restricted Share Award Activity

A summary of the Plans’ restricted share activity for the years ended December 31, 2020, 2019 and 2018 is as follows:


	2020			2019			2018
Restricted Shares	Common Shares	Weighted Average Grant-Date Fair Value		Common Shares	Weighted Average Grant-Date Fair Value		Common Shares	Weighted Average Grant-Date Fair Value
Outstanding at January 1	144,328	$	60.37	143,263	$	60.80	127,787	$	53.33
Granted	117,571	60.85		24,285	68.58		35,654	84.36
Vested and issued	(20,441)	74.42		(21,529)	70.99		(18,324)	54.31
Forfeited or canceled	(6,664)	73.54		(1,691)	79.50		(1,854)	63.50
Outstanding at end of year	234,794	$	59.02	144,328	$	60.37	143,263	$	60.80
Vested, but not issuable at end of year	93,969	$	52.11	92,183	$	52.24	90,520	$	51.94

A summary of the Plans’ performance-based stock award activity, based on the target level of the awards, for the years ended December 31, 2020, 2019 and 2018 is as follows:


	2020			2019			2018
Performance Shares	Common Shares	Weighted Average Grant-Date Fair Value		Common Shares	Weighted Average Grant-Date Fair Value		Common Shares	Weighted Average Grant-Date Fair Value
Outstanding at January 1	465,515	$	74.37	396,855	$	67.71	359,196	$	54.37
Granted	170,032	63.61		175,823	71.56		134,380	88.27
Added by performance factor at vesting	48,831	72.59		33,950	40.99		—	—
Vested and issued	(180,789)	72.59		(128,238)	41.00		(82,307)	44.39
Forfeited or canceled	(20,981)	72.46		(12,875)	75.08		(14,414)	60.05
Outstanding at end of year	482,608	$	71.15	465,515	$	74.37	396,855	$	67.71
Vested, but deferred at year end	34,609	$	43.14	33,828	$	43.01	21,530	$	43.54