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Stock Based Compensation - Non-vested Restricted Stock Options and PSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock
Number of Non-vested Restricted Shares
Non-vested shares, beginning balance (in shares)	1,603,766	837,123	507,536
Granted (in shares)	1,058,211	1,054,254	536,242
Vested (in shares)	(621,438)	(287,611)	(205,080)
Forfeited (in shares)	(131,432)	0	(1,575)
Non-vested shares, ending balance (in shares)	1,909,107	1,603,766	837,123
Weighted Average Per Share Grant Date Fair Value
Non-vested shares, beginning balance (in dollars per share)	$ 6.27	$ 6.18	$ 5.91
Granted (in dollars per share)	3.86	6.33	6.30
Vested (in dollars per share)	5.41	6.22	5.85
Forfeited (in dollars per share)	4.92	0	6.35
Non-vested shares, ending balance (in dollars per share)	$ 5.05	$ 6.27	$ 6.18
PSUs, Target
Number of Non-vested Restricted Shares
Non-vested shares, beginning balance (in shares)	2,902,014	2,018,518	842,792
Granted (in shares)	1,631,661	883,496	1,175,726
Vested (in shares)	(842,792)	0	0
Forfeited (in shares)	(314,143)	0	0
Non-vested shares, ending balance (in shares)	3,376,740	2,902,014	2,018,518
PSUs
Number of Non-vested Restricted Shares
Vested (in shares)	(974,074)
Weighted Average Per Share Grant Date Fair Value
Non-vested shares, beginning balance (in dollars per share)	$ 4.98	$ 4.09	$ 4.20
Granted (in dollars per share)	5.56	7.03	4.01
Vested (in dollars per share)	4.20	0	0
Forfeited (in dollars per share)	5.29	0	0
Non-vested shares, ending balance (in dollars per share)	$ 5.43	$ 4.98	$ 4.09
RSUs
Number of Non-vested Restricted Shares
Non-vested shares, beginning balance (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, ending balance (in shares)	1,016,252	441,746	0
Weighted Average Per Share Grant Date Fair Value
Non-vested shares, beginning balance (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, ending balance (in dollars per share)	$ 4.36	$ 6.23	$ 0

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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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