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Share-based compensation plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Activity related to restricted stock units

The activity related to restricted stock units for the year ended December 31, 2021 is as follows:

			Nonvested						Vested						Total						Average Grant Date Fair Value Per Share
Outstanding, December 31, 2020			209,583						75,863						285,446						$	50.19
Granted			201,570						—						201,570						$	57.77
Vested			(68,231)						68,231						—
Converted			—						(64,093)						(64,093)						$	53.28
Cancelled			(12,053)						—						(12,053)						$	55.98
Dividend equivalents			1,728						2,263						3,991						$	62.95
Outstanding, December 31, 2021			332,597						82,264						414,861						$	53.32

Activity related to performance contingent restricted stock units

The activity related to performance contingent restricted stock units for the year ended December 31, 2021 is as follows:

			Nonvested						Vested						Total						Average Grant Date Fair Value per Share
Outstanding, December 31, 2020			157,122						166,432						323,554						$49.15
Granted			145,696						—						145,696						$55.95
Performance adjustments			256,711						—						256,711						$54.28
Vested			(64,243)						64,243						—
Converted			—						(133,960)						(133,960)						$46.34
Cancelled			(14,633)						—						(14,633)						$54.79
Dividend equivalents			—						938						938						$62.95
Outstanding, December 31, 2021			480,653						97,653						578,306						$53.67

Estimated fair values of all SARs applying assumptions

The Company computed the estimated fair values of all SARs granted during 2019 using the Black-Scholes option-pricing model applying the assumptions set forth in the following table:

			2019
Expected dividend yield			2.7		%
Expected stock price volatility			16.6		%
Risk-free interest rate			2.6		%
Expected life of SARs			6 years

Company's SARs

The activity related to the Company’s SARs for the year ended December 31, 2021 is as follows: 

			Nonvested						Vested						Total						Weighted- average Exercise Price
Outstanding, December 31, 2020			397,677						873,751						1,271,428						$	53.83
Vested			(259,687)						259,687						—
Granted			—						—						—						$	—
Exercised			—						(363,102)						(363,102)						$	50.95
Forfeited/Expired			(13,826)						(14,829)						(28,655)						$	53.12
Outstanding, December 31, 2021			124,164						755,507						879,671						$	55.03
Exercisable, December 31, 2021			—						755,507						755,507						$	54.08

Schedule of other share-based compensation, activity

The activity related to deferred compensation for equity award units granted to both employees and non-employee directors combined is as follows:

			Total
Outstanding, December 31, 2020			372,413
Deferred			38,127
Converted			(40,527)
Dividend equivalents			10,744
Outstanding, December 31, 2021			380,757

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Tabular disclosure of share-based payment arrangement.

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Tabular disclosure of activity for outstanding award under share-based payment arrangement excluding share and unit options and nonvested award.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares.

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