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Stock-based Compensation - Restricted Stock Units (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restricted Stock Units (RSUs) [Member]
Non-vested RSU's, beginning balance (in shares)	428,295
Non-vested RSU's, weighted-average grant-date fair value, beginning balance (in dollars per share)	$ 24.42
Granted RSU's (in shares)	170,228	263,574
Granted RSU's, weighted-average grant-date fair value (in dollars per share)	$ 19.79
Vested RSU's (in shares)	(232,351)
Vested RSU's, weighted-average grant-date fair value (in dollars per share)	$ 22.28
Forfeited RSU's (in shares)	(2,415)
Forfeited RSU's, weighted-average grant-date fair value (in dollars per share)	$ 24.62
Non-vested RSU's, ending balance (in shares)	363,757
Non-vested RSU's, weighted-average grant-date fair value, ending balance (in dollars per share)	$ 23.62
Vested RSU's but unissued (in shares)	216,777
Vested RSU's but unissued, weighted-average grant-date fair value (in dollars per share)	$ 23.26
Performance-based Restricted Stock Units [Member]
Non-vested RSU's, beginning balance (in shares)	34,186
Non-vested RSU's, weighted-average grant-date fair value, beginning balance (in dollars per share)	$ 22.38
Granted RSU's (in shares)	72,143	57,870
Granted RSU's, weighted-average grant-date fair value (in dollars per share)	$ 20.38
Vested RSU's (in shares)	(35,149)
Vested RSU's, weighted-average grant-date fair value (in dollars per share)	$ 20.54
Forfeited RSU's (in shares)	0
Forfeited RSU's, weighted-average grant-date fair value (in dollars per share)	$ 0
Non-vested RSU's, ending balance (in shares)	71,180
Non-vested RSU's, weighted-average grant-date fair value, ending balance (in dollars per share)	$ 21.26
Vested RSU's but unissued (in shares)	62,515
Vested RSU's but unissued, weighted-average grant-date fair value (in dollars per share)	$ 21.35

X

- Definition

Represents share-based compensation arrangement by share based payment award, equity instruments other than options, vested but unissued, number.

+ References

No definition available.

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Represents share-based compensation arrangement by share based payment award, equity instruments other than options, vested but unissued, weighted average grant date fair value.

+ References

No definition available.

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- Definition

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

+ References

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-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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-Publisher FASB
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-Topic 718
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-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).

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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).

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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.

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- Definition

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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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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