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Stock-Based Compensation (Details) - $ / shares	1 Months Ended	12 Months Ended
	Feb. 28, 2019	Dec. 31, 2019	Dec. 31, 2018
Performance Awards
Common stock Nonvested, Number of Shares:
Unvested at beginning		98,958	62,338
Issued	43,145	43,145	42,533
Forfeited		(65,589)	(5,913)
Vested		(17,734)
Unvested at end		58,780	98,958
Common stock Nonvested, Weighted Average Grant Date Fair Value:
Unvested at beginning		$ 54.76	$ 50.45
Issued		55.76	60.45
Forfeited		55.25	50.28
Unvested at end		$ 57.74	$ 54.76
Time Vested Awards
Common stock Nonvested, Number of Shares:
Unvested at beginning		173,721	164,043
Issued		112,636	94,344
Forfeited		(44,600)	(7,132)
Vested		(131,043)	(77,534)
Unvested at end		110,714	173,721
Common stock Nonvested, Weighted Average Grant Date Fair Value:
Unvested at beginning		$ 58.93	$ 53.57
Issued		55.76	60.45
Forfeited		58.73	56.48
Vested		57.20	49.67
Unvested at end		$ 57.84	$ 58.93

X

- Definition

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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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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