Stock-Based Compensation - Restricted Stock Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock Units
Outstanding
Beginning of period (in shares)	157,937
Granted (in shares)	62,520	81,230	135,350
Vested (in shares)	(85,279)
Forfeited (in shares)	(7,755)
Ending of period (in shares)	127,423	157,937
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 28.96
Granted (in dollars per share)	41.04	$ 32.36	$ 28.97
Vested (in dollars per share)	27.94
Forfeited (in dollars per share)	30.80
Outstanding at ending of period (in dollars per share)	$ 36.22	$ 28.96
Performance Stock Units
Outstanding
Beginning of period (in shares)	236,700
Granted (in shares)	58,178	64,700	126,000
Vested (in shares)	(85,504)
Forfeited (in shares)	(11,800)
Ending of period (in shares)	197,574	236,700
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 26.21
Granted (in dollars per share)	43.80	$ 35.16	$ 26.31
Vested (in dollars per share)	19.05
Forfeited (in dollars per share)	33.21
Outstanding at ending of period (in dollars per share)	$ 33.98	$ 26.21

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)
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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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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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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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- 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
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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.

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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.

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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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