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Stock-Based Compensation (Summary of Unit Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock
Number of Units
Outstanding at beginning of year (in shares)	536	497	441
Granted (in shares)	764	359	261
Vested (in shares)	(317)	(310)	(198)
Forfeited (in shares)	(26)	(10)	(7)
Outstanding at end of year (in shares)	957	536	497
Weighted Average Price at Grant
Outstanding at beginning of year (in dollars per share)	$ 7.98	$ 11.89	$ 10.91
Granted (in dollars per share)	7.02	4.13	12.68
Vested (in dollars per share)	6.31	9.81	10.75
Forfeited (in dollars per share)	6.94	7.25	11.59
Outstanding at end of year (in dollars per share)	$ 6.94	$ 7.98	$ 11.89
Performance Shares
Number of Units
Outstanding at beginning of year (in shares)	448	420	316
Granted (in shares)	446	225	223
Forfeited (in shares)	(223)	(197)	(119)
Outstanding at end of year (in shares)	671	448	420
Weighted Average Price at Grant
Outstanding at beginning of year (in dollars per share)	$ 11.71	$ 16.91	$ 12.29
Granted (in dollars per share)	7.01	3.51	19.96
Forfeited (in dollars per share)	19.96	13.43	10.42
Outstanding at end of year (in dollars per share)	$ 5.84	$ 11.71	$ 16.91

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- Definition

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

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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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