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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock Based Compensation Plan [Abstract] |
Share Option and Award Activity | The following table summarizes our equity award activity during the years ended December 31, 2020, 2019, and 2018:
|  | Service-Based Restricted Stock Awards |  |  | Performance-Based Restricted Stock Awards |  |  | Stock-Settled Appreciation Rights |
|  | Shares or Units (#) |  |  | Weighted-Average Award Price($) |  |  | Shares or Units(#) |  |  | Weighted-Average Award Price ($) |  |  | Rights(#) |  |  | Weighted-Average Award Price($) |
Outstanding at December 31, 2017 |  |  | 254,490 |  |  |  | 21.88 |  |  |  | 179,774 |  |  |  | 21.42 |  |  |  | 57,000 |  |  |  | 18.14 |
Granted |  |  | 141,722 |  |  |  | 22.73 |  |  |  | 103,940 |  |  |  | 22.95 |  |  |  | — |  |  |  | — |
Awards vested or rights exercised |  |  | (132,872 | ) |  |  | 22.45 |  |  |  | (48,661 | ) |  |  | 24.10 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (14,198 | ) |  |  | 21.94 |  |  |  | (25,299 | ) |  |  | 21.40 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2018 |  |  | 249,142 |  |  |  | 22.05 |  |  |  | 209,754 |  |  |  | 21.56 |  |  |  | 57,000 |  |  |  | 18.14 |
Granted |  |  | 137,768 |  |  |  | 20.24 |  |  |  | 113,522 |  |  |  | 20.29 |  |  |  | — |  |  |  | — |
Awards vested or rights exercised |  |  | (133,364 | ) |  |  | 22.27 |  |  |  | (57,351 | ) |  |  | 18.93 |  |  |  | (49,500 | ) |  |  | 18.14 |
Forfeited |  |  | (18,736 | ) |  |  | 21.25 |  |  |  | (51,116 | ) |  |  | 22.45 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2019 |  |  | 234,810 |  |  |  | 20.93 |  |  |  | 214,809 |  |  |  | 21.38 |  |  |  | 7,500 |  |  |  | 18.14 |
Granted |  |  | 145,375 |  |  |  | 20.42 |  |  |  | 120,727 |  |  |  | 20.42 |  |  |  | — |  |  |  | — |
Awards vested or rights exercised |  |  | (130,434 | ) |  |  | 20.69 |  |  |  | (44,875 | ) |  |  | 22.12 |  |  |  | (7,500 | ) |  |  | 18.14 |
Forfeited |  |  | (10,470 | ) |  |  | 20.41 |  |  |  | (76,766 | ) |  |  | 20.29 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2020 |  |  | 239,281 |  |  |  | 20.77 |  |  |  | 213,895 |  |  |  | 21.08 |  |  |  | — |  |  |  | — |
Restricted units expected to vest |  |  | 239,281 |  |  |  | 20.77 |  |  |  | 289,510 |  |  |  | 20.90 |  |  |  | — |  |  |  | — |
Exercisable at December 31, 2019 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,500 |  |  |  | 18.14 |
Exercisable at December 31, 2018 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 57,000 |  |  |  | 18.14 |

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