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Stock-Based Compensation and Directors Stock Purchase Plan (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary Of The Status Of Nonvested Share Awards

Nonvested Restricted Stock Awards

Nonvested stock is awarded to key employees by action of the Company's Compensation and Human Resources Committee and Board of Directors. These awards generally vest after 4 to 7 years of continued employment, but vesting terms may vary according to the specifics of the individual grant agreement. There are restrictions as to transferability, sale, pledging, or assigning, among others, prior to the end of the vesting period. Dividend and voting rights are conferred upon grant of restricted stock awards. A summary of the status of the Company’s nonvested share awards as of December 31, 2020 and changes during the year then ended is presented below.

			Shares			Weighted Average Grant Date Fair Value
Nonvested at January 1, 2020			1,159,180			$	45.30
Granted			244,468			60.90
Vested			(292,100)			32.40
Forfeited			(11,682)			51.77
Nonvested at December 31, 2020			1,099,866			$	52.11

Summary Of SAR Activity

(Dollars in thousands, except per share data)			Shares			Weighted Average Exercise Price			Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value
Outstanding at January 1, 2020			1,101,905			$	41.48
Granted			108,262			60.17
Forfeited			(7,717)			55.27
Expired			(576)			51.70
Exercised			(195,978)			33.43
Outstanding at December 31, 2020			1,005,896			$	44.95		6.2			years			$	20,875
Exercisable at December 31, 2020			600,469			$	38.30		5.0			years			$	16,452

Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block]

			2020			2019			2018
Weighted per share average fair value at grant date			$9.64			$10.81			$10.74
Assumptions:
Dividend yield			1.7		%	1.7		%	1.6		%
Volatility			20.2		%	19.8		%	20.6		%
Risk-free interest rate			1.0		%	2.6		%	2.7		%
Expected term			5.8 years			6.0 years			6.6 years

Schedule Of Additional Information About Stock Options and SARs Exercises

Additional information about stock options and SARs exercised is presented below.

(In thousands)			2020			2019			2018
Intrinsic value of options and SARs exercised			$	6,278		$	7,109		$	9,632
Tax benefit realized from options and SARs exercised			$	1,252		$	1,385		$	1,928

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- Definition

Tabular disclosure of the changes in outstanding nonvested shares.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year.

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