Stock-Based Compensation (Details) - $ / shares	1 Months Ended	12 Months Ended
Feb. 28, 2018	Dec. 31, 2018	Dec. 31, 2017
Performance Shares [Member]
Common stock Nonvested, Number of Shares:
Unvested at beginning		62,338	33,226
Issued	42,533	42,533	36,523
Forfeited		(5,913)	(2,520)
Vested			(4,891)
Unvested at end		98,958	62,338
Common stock Nonvested, Weighted Average Grant Date Fair Value:
Unvested at beginning		$ 50.45	$ 42.60
Issued		60.45	57.49
Forfeited		50.28	41.93
Vested			54.70
Unvested at end		$ 54.76	$ 50.45
Time Vested Awards [Member]
Common stock Nonvested, Number of Shares:
Unvested at beginning		164,043	262,966
Issued		94,344	91,097
Forfeited		(7,132)	(2,360)
Vested		(77,534)	(187,600)
Unvested at end		173,721	164,043
Common stock Nonvested, Weighted Average Grant Date Fair Value:
Unvested at beginning		$ 53.57	$ 33.60
Issued		60.45	62.70
Forfeited		56.48	49.52
Vested		49.67	30.07
Unvested at end		$ 58.93	$ 53.57

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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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).

+ References

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-Publisher FASB
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-Topic 718
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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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- Definition

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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

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