Share-Based Compensation - Summary of Activity of the Outstanding Share-Based Compensation Awards (Details)	6 Months Ended
Jun. 30, 2018 $ / shares shares
Performance Unit Incentive Plan (“PUP”)
Summary of activity of the outstanding share-based compensation awards
Beginning Balance, Shares \| shares	239,338
Granted, Shares \| shares	76,925
Vested, Shares \| shares	(75,761)
Forfeited, Shares \| shares	0
Ending Balance, Shares \| shares	240,502
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	$ 32.80
Granted, Weighted-Average Grant Date Fair Value \| $ / shares	52.03
Vested, Weighted-Average Grant Date Fair Value \| $ / shares	27.29
Forfeited, Weighted-Average Grant Date Fair Value \| $ / shares	0
Ending Balance, Weighted-Average Grant Date Fair Value \| $ / shares	$ 40.68
Restricted Stock
Summary of activity of the outstanding share-based compensation awards
Beginning Balance, Shares \| shares	206,899
Granted, Shares \| shares	47,157
Vested, Shares \| shares	(62,684)
Forfeited, Shares \| shares	(2,306)
Ending Balance, Shares \| shares	189,066
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	$ 33.16
Granted, Weighted-Average Grant Date Fair Value \| $ / shares	51.93
Vested, Weighted-Average Grant Date Fair Value \| $ / shares	27.28
Forfeited, Weighted-Average Grant Date Fair Value \| $ / shares	39.84
Ending Balance, Weighted-Average Grant Date Fair Value \| $ / shares	$ 39.71
Restricted Stock Units
Summary of activity of the outstanding share-based compensation awards
Beginning Balance, Shares \| shares	12,750
Granted, Shares \| shares	3,669
Vested, Shares \| shares	(4,300)
Forfeited, Shares \| shares	(258)
Ending Balance, Shares \| shares	11,861
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	$ 30.94
Granted, Weighted-Average Grant Date Fair Value \| $ / shares	52.28
Vested, Weighted-Average Grant Date Fair Value \| $ / shares	27.35
Forfeited, Weighted-Average Grant Date Fair Value \| $ / shares	37.69
Ending Balance, Weighted-Average Grant Date Fair Value \| $ / shares	$ 38.70

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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- 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

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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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No definition available.

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- Definition

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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- Definition

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
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- Definition

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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