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
|