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Earnings Per Common Share And Share Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Earnings Per Common Share And Share Awards [Line Items]
Anti-dilutive shares excluded from computation of diluted earnings per share	15
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 266
SARs
Earnings Per Common Share And Share Awards [Line Items]
SARs expiration period	7 years
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	0	7	14
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Grant Date Fair Value		$ 35.49
Share-based Payment Arrangement, Expense	$ 71	$ 118
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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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