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Stock Based Compensation - Non-vested Restricted Stock Options and PSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Number of Non-vested Restricted Shares
Non-vested shares, beginning balance (in shares)	837,123	507,536	422,928
Granted (in shares)	1,054,254	536,242	289,792
Vested (in shares)	(287,611)	(205,080)	(200,064)
Forfeited (in shares)	0	(1,575)	(5,120)
Non-vested shares, ending balance (in shares)	1,603,766	837,123	507,536
Weighted Average Per Share Grant Date Fair Value
Non-vested shares, beginning balance (in dollars per share)	$ 6.18	$ 5.91	$ 6.36
Granted (in dollars per share)	6.33	6.30	5.63
Vested (in dollars per share)	6.22	5.85	6.55
Forfeited (in dollars per share)	0	6.35	6.25
Non-vested shares, ending balance (in dollars per share)	$ 6.27	$ 6.18	$ 5.91
PSUs
Number of Non-vested Restricted Shares
Non-vested shares, beginning balance (in shares)	2,018,518	842,792	0
Granted (in shares)	883,496	1,175,726	842,792
Vested (in shares)	0	0	0
Non-vested shares, ending balance (in shares)	2,902,014	2,018,518	842,792
Weighted Average Per Share Grant Date Fair Value
Non-vested shares, beginning balance (in dollars per share)	$ 4.09	$ 4.20	$ 0
Granted (in dollars per share)	7.03	4.01	4.20
Vested (in dollars per share)	0	0	0
Non-vested shares, ending balance (in dollars per share)	$ 4.98	$ 4.09	$ 4.20
Restricted Stock Units (RSUs)
Number of Non-vested Restricted Shares
Non-vested shares, beginning balance (in shares)	0
Granted (in shares)	441,746
Vested (in shares)	0
Non-vested shares, ending balance (in shares)	441,746	0
Weighted Average Per Share Grant Date Fair Value
Non-vested shares, beginning balance (in dollars per share)	$ 0
Granted (in dollars per share)	6.23
Vested (in dollars per share)	0
Non-vested shares, ending balance (in dollars per share)	$ 6.23	$ 0

X

- Definition

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

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-SubTopic 10
-Section 50
-Paragraph 2
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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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