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Stock Based Compensation - Non-vested Restricted Stock, PSU and RSU Award Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restricted Stock
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	1,909,107	1,603,766
Granted (in shares)	1,217,671	939,446
Vested (in shares)	(884,959)	(538,243)
Forfeited (in shares)	(21,482)	(9,997)
Non-vested shares at end of period (in shares)	2,220,337	1,994,972
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 5.05	$ 6.27
Granted (in dollars per share)	3.59	3.82
Vested (in dollars per share)	5.49	6.24
Forfeited (in dollars per share)	4.19	6.33
Non-vested shares at end of period (in dollars per share)	$ 4.08	$ 5.12
PSUs, Target
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	3,376,740	2,902,014
Granted (in shares)	844,534	1,563,910
Vested (in shares)	(1,074,918)	(842,792)
Non-vested shares at end of period (in shares)	3,146,356	3,623,132
PSUs
Number of Non-vested Restricted Shares
Vested (in shares)	(733,496)	(974,074)
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 5.43	$ 4.98
Granted (in dollars per share)	4.87	5.49
Vested (in dollars per share)	4.00	4.20
Non-vested shares at end of period (in dollars per share)	$ 5.76	$ 5.38
RSUs
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	1,016,252	441,746
Granted (in shares)	422,267	781,955
Vested (in shares)	(383,639)	(147,254)
Non-vested shares at end of period (in shares)	1,054,880	1,076,447
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 4.36	$ 6.23
Granted (in dollars per share)	3.72	3.69
Vested (in dollars per share)	4.58	6.23
Non-vested shares at end of period (in dollars per share)	$ 4.03	$ 4.38

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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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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