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Stock Incentive Plans - Performance Stock Units (Details) - Performance Shares - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Units
Beginning balance (in shares)	796,532	781,923	785,797
Granted (in shares)	352,035	296,050	293,111
Additional units from dividends (in shares)	9,556	40,662	35,197
Vested (in shares)	(245,937)	(251,375)	(218,514)
Forfeited (in shares)		(70,728)	(113,668)
Ending balance (in shares)	912,186	796,532	781,923
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 11.16	$ 11.19	$ 10.42
Granted (in dollars per share)	9.02	10.14	9.82
Additional unit from dividends (in dollars per share)	10.42	10	11.24
Vested (in dollars per share)	11.00	8.80	11.98
Forfeited (in dollars per share)		9.93	9.86
Ending balance (in dollars per share)	$ 9.63	$ 11.16	$ 11.19
Stock of common stock earned for the PSUs vested (as a percent)	123.07%	74.33%	51.75%

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 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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Percentage of vesting of award under share-based payment arrangement.

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