Stock Based Compensation - Non-vested Restricted Stock Options and PSUs (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Number of Non-vested Restricted Shares
Non-vested shares, beginning balance (in shares)	507,536	422,928	319,058
Granted (in shares)	536,242	289,792	332,921
Vested (in shares)	(205,080)	(200,064)	(229,051)
Forfeited (in shares)	(1,575)	(5,120)	0
Non-vested shares, ending balance (in shares)	837,123	507,536	422,928
Weighted Average Per Share Grant Date Fair Value
Non-vested shares, beginning balance (in dollars per share)	$ 5.91	$ 6.36	$ 6.40
Granted (in dollars per share)	6.30	5.63	6.54
Vested (in dollars per share)	5.85	6.55	6.67
Forfeited (in dollars per share)	6.35	6.25	0
Non-vested shares, ending balance (in dollars per share)	$ 6.18	$ 5.91	$ 6.36
PSUs
Number of Non-vested Restricted Shares
Non-vested shares, beginning balance (in shares)	842,792	0
Granted (in shares)	1,175,726	842,792
Vested (in shares)	0	0
Non-vested shares, ending balance (in shares)	2,018,518	842,792	0
Weighted Average Per Share Grant Date Fair Value
Non-vested shares, beginning balance (in dollars per share)	$ 4.20	$ 0
Granted (in dollars per share)	4.01	4.20
Vested (in dollars per share)	0	0
Non-vested shares, ending balance (in dollars per share)	$ 4.09	$ 4.20	$ 0

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

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-Section 50
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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).

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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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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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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 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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