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Share-Based Compensation - Summary of Activity of the Outstanding Share-Based Compensation Awards (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Performance Unit Incentive Plan (“PUP”)
Summary of activity of the outstanding share-based compensation awards
Beginning Balance, Shares | shares	239,809
Granted, Shares | shares	73,418
Vested, Shares | shares	(95,309)
Forfeited, Shares | shares	(2,192)
Ending Balance, Shares | shares	215,726
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted-Average Grant Date Fair Value | $ / shares	$ 40.65
Granted, Weighted-Average Grant Date Fair Value | $ / shares	58.28
Vested, Weighted-Average Grant Date Fair Value | $ / shares	26.98
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares	55.92
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares	$ 52.54
Restricted Stock
Summary of activity of the outstanding share-based compensation awards
Beginning Balance, Shares | shares	176,769
Granted, Shares | shares	55,440
Vested, Shares | shares	(82,647)
Forfeited, Shares | shares	(5,323)
Ending Balance, Shares | shares	144,239
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted-Average Grant Date Fair Value | $ / shares	$ 40.87
Granted, Weighted-Average Grant Date Fair Value | $ / shares	57.86
Vested, Weighted-Average Grant Date Fair Value | $ / shares	32.15
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares	50.03
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares	$ 52.05
Restricted Stock Units
Summary of activity of the outstanding share-based compensation awards
Beginning Balance, Shares | shares	12,090
Granted, Shares | shares	5,025
Vested, Shares | shares	(5,377)
Forfeited, Shares | shares	(115)
Ending Balance, Shares | shares	11,623
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted-Average Grant Date Fair Value | $ / shares	$ 39.04
Granted, Weighted-Average Grant Date Fair Value | $ / shares	56.81
Vested, Weighted-Average Grant Date Fair Value | $ / shares	26.98
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares	52.15
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares	$ 52.17

X

- Definition

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

+ References

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=116856206&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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-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
-Topic 718
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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).

+ References

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-Publisher FASB
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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

+ References

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