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Stock Based Compensation - Non-vested Restricted Stock, PSU and RSU Award Activity (Details) - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Restricted Stock
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	1,603,766	837,123
Granted (in shares)	939,446	1,054,254
Vested (in shares)	(621,438)	(287,611)
Forfeited (in shares)	(131,432)	0
Non-vested shares at end of period (in shares)	1,790,342	1,603,766
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 6.27	$ 6.18
Granted (in dollars per share)	3.82	6.33
Vested (in dollars per share)	5.41	6.22
Forfeited (in dollars per share)	4.92	0
Non-vested shares at end of period (in dollars per share)	$ 5.10	6.27
PSUs
Number of Non-vested Restricted Shares
Vested (in shares)	(974,074)
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 4.98	4.09
Granted (in dollars per share)	5.56	7.03
Vested (in dollars per share)	4.20	0
Forfeited (in dollars per share)	5.29	0
Non-vested shares at end of period (in dollars per share)	$ 5.43	$ 4.98
PSUs, Target
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	2,902,014	2,018,518
Granted (in shares)	1,631,661	883,496
Vested (in shares)	(842,792)	0
Forfeited (in shares)	(314,143)	0
Non-vested shares at end of period (in shares)	3,376,740	2,902,014
RSUs
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	441,746	0
Granted (in shares)	815,830	441,746
Vested (in shares)	(147,254)	0
Forfeited (in shares)	(94,070)	0
Non-vested shares at end of period (in shares)	1,016,252	441,746
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 6.23	$ 0
Granted (in dollars per share)	3.69	6.23
Vested (in dollars per share)	6.23	0
Forfeited (in dollars per share)	4.37	0
Non-vested shares at end of period (in dollars per share)	$ 4.36	$ 6.23

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- Definition

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

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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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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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Weighted average grant-date fair value of non-vested options forfeited.

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