Stock-Based Compensation - Summary of Restricted Stock Units (Details) - $ / shares	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Balance outstanding at December 31 (shares)	469,227	562,082
Units granted (shares)	135,473	131,412
Units vested (shares)	(229,545)	(214,881)
Units forfeited (shares)	(46,571)	0
Balance outstanding at March 31 (shares)	328,584	478,613
Weighted-Average Grant-Date Fair Value per Share
Balance outstanding at December 31 (in dollars per share)	$ 10.75	$ 10.72
Units granted (in dollars per share)	5.76	11.68
Units vested (in dollars per share)	10.60	10.69
Units forfeited (in dollars per share)	10.89	0.00
Balance outstanding at March 31 (in dollars per share)	$ 8.78	$ 11.00
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Balance outstanding at December 31 (shares)	125,422	0
Units granted (shares)	0	125,422
Units vested (shares)	0	0
Units forfeited (shares)	(26,882)	0
Balance outstanding at March 31 (shares)	98,540	125,422
Weighted-Average Grant-Date Fair Value per Share
Balance outstanding at December 31 (in dollars per share)	$ 11.68	$ 0.00
Units granted (in dollars per share)	0.00	11.68
Units vested (in dollars per share)	0.00	0.00
Units forfeited (in dollars per share)	11.68	0.00
Balance outstanding at March 31 (in dollars per share)	$ 11.68	$ 11.68

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.

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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).

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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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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

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.

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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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- 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.

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