Stock Based Compensation - Non-vested Restricted Stock, PSU and RSU Award Activity (Details) - $ / shares	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Restricted Stock
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)		1,603,766	837,123	837,123
Granted (in shares)		939,446	1,054,254
Vested (in shares)		(621,438)	(287,611)
Forfeited (in shares)	(9,433)	(19,430)	0
Non-vested shares at end of period (in shares)	1,902,344	1,902,344	1,603,766	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	$ 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)		3.26	0
Non-vested shares at end of period (in dollars per share)	$ 5.09	$ 5.09	$ 6.27	$ 6.27
PSUs
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)		2,902,014	2,018,518	2,018,518
Granted (in shares)		1,631,661	883,496
Vested (in shares)		(842,792)	0	(974,074)
Non-vested shares at end of period (in shares)	3,690,883	3,690,883	2,902,014	2,902,014
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)		$ 4.98	$ 4.09	$ 4.09
Granted (in dollars per share)		5.56	7.03
Vested (in dollars per share)		4.20	0
Non-vested shares at end of period (in dollars per share)	$ 5.41	$ 5.41	$ 4.98	$ 4.98
RSUs
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)		441,746	0	0
Granted (in shares)		815,830	441,746
Vested (in shares)		(147,254)	0
Non-vested shares at end of period (in shares)	1,110,322	1,110,322	441,746	441,746
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)		$ 6.23	$ 0	$ 0
Granted (in dollars per share)		3.69	6.23
Vested (in dollars per share)		6.23	0
Non-vested shares at end of period (in dollars per share)	$ 4.36	$ 4.36	$ 6.23	$ 6.23

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

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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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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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Weighted average grant-date fair value of non-vested options forfeited.

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