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Stock-Based Compensation (Schedule of Outstanding Restricted Stock) (Details) - Long-Term Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Units
Nonvested, beginning (in shares)	129,251	103,063	91,790
Granted during the period (in shares)	82,826	66,060	48,322
Vested during the period (in shares)	(51,757)	(35,703)	(28,514)
Forfeited or expired during the period (in shares)	(954)	(4,169)	(8,535)
Nonvested, ending (in shares)	159,366	129,251	103,063
Weighted-Average Grant-Date Fair Value
Nonvested, beginning (in dollars per share)	$ 32.39	$ 24.08	$ 18.65
Granted during the period (in dollars per share)	36.36	40.04	31.05
Vested during the period (in dollars per share)	25.02	22.82	20.05
Forfeited or expired during the period (in dollars per share)	41.93	29.99	18.34
Nonvested, ending (in dollars per share)	$ 36.79	$ 32.39	$ 24.08

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

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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- Definition

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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- Definition

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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- Definition

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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- Definition

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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