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Stock-Based Compensation (Summary of Unit Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Number of Units
Outstanding at beginning of year (in shares)	497	441	420
Shares granted (in shares)	359	261	257
Vested (in shares)	(310)	(198)	(229)
Performance LTIP units forfeited/cancelled (in shares)	(10)	(7)	(7)
Outstanding at end of year (in shares)	536	497	441
Weighted Average Price at Grant
Outstanding at beginning of year (in dollars per share)	$ 11.89	$ 10.91	$ 11.87
Granted (in dollars per share)	4.13	12.68	9.90
Vested (in dollars per share)	9.81	10.75	11.54
Cancelled (in dollars per share)	7.25	11.59	10.50
Outstanding at end of year (in dollars per share)	$ 7.98	$ 11.89	$ 10.91
Performance Shares
Number of Units
Outstanding at beginning of year (in shares)	420	316	381
Shares granted (in shares)	225	223	197
Performance LTIP units forfeited/cancelled (in shares)	(197)	(119)	(262)
Outstanding at end of year (in shares)	448	420	316
Weighted Average Price at Grant
Outstanding at beginning of year (in dollars per share)	$ 16.91	$ 12.29	$ 11.97
Granted (in dollars per share)	3.51	19.96	13.43
Cancelled (in dollars per share)	13.43	10.42	12.67
Outstanding at end of year (in dollars per share)	$ 11.71	$ 16.91	$ 12.29

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 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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