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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Activity Under All Stock Plans and Weighted Average Exercise Prices | The following table reflects activity under all stock plans from December 31, 2018 through December 31, 2021, and the weighted average exercise prices (in thousands, except per share amounts):
|  |  | Non-Executive Officer Time-Based Awards |  |  | Performance-Based Awards With Market Conditions |  |  | Performance-Based Awards Without Market Conditions |  | Total Awards With Performance Condition
|  |  | Number of Shares/ Units |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares/ Units |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares/ Units |  | Weighted Average Grant Date Fair Value |  | Number of Shares/ Units |  | Weighted Average Grant Date Fair Value
Outstanding, December 31, 2018 |  |  | 1,085 |  |  |  | $50.24 |  |  | 358 |  |  |  | $45.93 |  |  | 608 |  |  |  | $51.74 |  | 966 |  |  | $49.58
Granted |  |  | 434 |  |  |  | $66.66 |  |  | 236 |  |  |  | $74.01 |  |  | — |  |  |  | — |  | 236 |  |  | $74.01
Restrictions lapsed |  |  | (557) |  |  |  | $50.29 |  |  | (338) |  |  |  | $45.93 |  |  | — |  |  |  | — |  | (338) |  |  | $45.93
Forfeited |  |  | (15) |  |  |  | $53.85 |  |  | (20) |  |  |  | $45.93 |  |  | — |  |  |  | — |  | (20) |  |  | $45.93
Outstanding, December 31, 2019 |  |  | 947 |  |  |  | $57.67 |  |  | 236 |  |  |  | $74.01 |  |  | 608 |  |  |  | $51.74 |  | 844 |  |  | $57.97
Granted |  |  | 625 |  |  |  | $54.92 |  |  | 223 |  |  |  | $66.86 |  |  | 70 |  |  |  | $47.45 |  | 293 |  |  | $62.22
Restrictions lapsed |  |  | (526) |  |  |  | $54.57 |  |  | — |  |  |  | — |  |  | (400) |  |  |  | $47.45 |  | (400) |  |  | $47.45
Forfeited |  |  | (26) |  |  |  | $58.37 |  |  | — |  |  |  | — |  |  | — |  |  |  | — |  | — |  |  | —
Outstanding, December 31, 2020 |  |  | 1,020 |  |  |  | $57.57 |  |  | 459 |  |  |  | $70.53 |  |  | 278 |  |  |  | $56.83 |  | 737 |  |  | $65.36
Granted |  |  | 507 |  |  |  | $76.49 |  |  | 167 |  |  |  | $88.77 |  |  | 70 |  |  |  | $56.83 |  | 237 |  |  | $79.40
Restrictions lapsed |  |  | (530) |  |  |  | $60.10 |  |  | — |  |  |  | — |  |  | (348) |  |  |  | $56.83 |  | (348) |  |  | $56.83
Forfeited |  |  | (46) |  |  |  | $65.40 |  |  | — |  |  |  | — |  |  | — |  |  |  | — |  | — |  |  | —
Outstanding, December 31, 2021 |  |  | 951 |  |  |  | $65.85 |  |  | 626 |  |  |  | $75.41 |  |  | — |  |  |  | — |  | 626 |  |  | $75.41

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