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Stock Based Compensation - Non-vested Restricted Stock, PSU and RSU Award Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restricted Stock
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	837,123	507,536
Granted (in shares)	1,054,254	536,242
Vested (in shares)	(287,611)	(171,747)
Forfeited (in shares)	0
Non-vested shares at end of period (in shares)	1,603,766	872,031
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 6.18	$ 5.91
Granted (in dollars per share)	6.33	6.30
Vested (in dollars per share)	6.22	5.88
Non-vested shares at end of period (in dollars per share)	$ 6.27	$ 6.16
Performance Share Awards
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	2,018,518	842,792
Granted (in shares)	883,496	1,137,525
Vested (in shares)	0	0
Non-vested shares at end of period (in shares)	2,902,014	1,980,317
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 4.09	$ 4.20
Granted (in dollars per share)	7.03	4.00
Vested (in dollars per share)	0	0
Non-vested shares at end of period (in dollars per share)	$ 4.98	$ 4.08
Fair value, expected term	3 years
RSUs
Number of Non-vested Restricted Shares
Non-vested shares at beginning of period (in shares)	0
Granted (in shares)	441,746
Vested (in shares)	0
Non-vested shares at end of period (in shares)	441,746
Weighted Average Per Share Grant Date Fair Value
Non-vested shares at beginning of period (in dollars per share)	$ 0
Granted (in dollars per share)	6.23
Vested (in dollars per share)	0
Non-vested shares at end of period (in dollars per share)	$ 6.23

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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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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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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