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

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of shares issued under share-based payment arrangement.

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Stock-Based Compensation (Restricted Shares) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted - Average Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	3,680
Share-based Payment Arrangement, Expense		$ 3,947,000	$ 3,963,000	$ 2,920,000
Performance-based vesting restricted stock [Member]
Number of Shares
Outstanding at January 1 (in shares)	253,884	253,884
Awarded		80,338
Released		56,827
Forfeited (in shares)		26,403
Outstanding at December 31 (in shares)		250,992	253,884
Weighted - Average Grant Date Fair Value
Outstanding at January 1 (in dollars per share)	$ 33.29	$ 33.29
Awarded (usd per share)		32.91
Released (usd per share)		32.42
Forfeited (in dollars per share)		33.33
Outstanding at December 31 (in dollars per share)		$ 33.36	$ 33.29
Time-based vesting restricted stock [Member]
Number of Shares
Outstanding at January 1 (in shares)	32,230	32,230
Awarded		48,064
Released		5,250
Forfeited (in shares)		7,286
Outstanding at December 31 (in shares)		67,758	32,230
Weighted - Average Grant Date Fair Value
Outstanding at January 1 (in dollars per share)	$ 33.05	$ 33.05
Awarded (usd per share)		19.67
Released (usd per share)		32.76
Forfeited (in dollars per share)		31.85
Outstanding at December 31 (in dollars per share)		$ 23.71	$ 33.05
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		48,064
Performance Shares [Member]
Weighted - Average Grant Date Fair Value
Share-based Payment Arrangement, Expense		$ (12,000)	$ 130,000	$ 156,000