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Earnings Per Common Share And Share Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Earnings Per Common Share And Share Awards [Line Items]
Anti-dilutive shares excluded from computation of diluted earnings per share	14			20			14	20
Number of SARs granted where exercise price was less than market price on date of grant							0	0
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Net of Forfeitures		5			4	7
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Grant Date Fair Value							$ 59.83	$ 34.45
SARs
Earnings Per Common Share And Share Awards [Line Items]
SARs expiration period							7 years
Share-based Payment Arrangement, Expense							$ 206	$ 192
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 401						$ 401
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Net of Forfeitures			0				5		14
Maximum | SARs
Earnings Per Common Share And Share Awards [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award							250
SARs vesting period							5 years

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Earnings Per Common Share And Share Awards [Line Items]

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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