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Employee Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Employee Stock Plans |
Schedule of information relates to the stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted- |  | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Value
​ | ​ | Shares | ​ | Price | ​ | Life | ​ | (thousands)
Outstanding at December 31, 2022 |  | 568,319 | ​ | $ | 76.65 |  |  |  | ​ |
Exercised |  | (235,612) | ​ |  | 74.75 |  |  |  | ​ |
Forfeited |  | (10,455) | ​ |  | 79.28 |  |  |  | ​ |
Outstanding at December 31, 2023 |  | 322,252 | ​ |  | 76.73 |  | 55 months | ​ | $ | 14,668
Exercisable at December 31, 2023 |  | 272,555 | ​ | $ | 76.28 |  | 52 months | ​ | $ | 12,529
Schedule of information summarizes the changes in non-vested performance shares, performance units, restricted stock, and restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average Grant
​ | ​ | Shares | ​ | Date Fair Value
Non-vested shares at December 31, 2022 |  | 927,662 | ​ | $ | 103.61
Granted |  | 415,001 | ​ |  | 117.91
Vested |  | (463,056) | ​ |  | 77.18
Forfeited |  | (59,387) | ​ |  | 114.78
Non-vested shares at December 31, 2023 |  | 820,220 | ​ | $ | 124.95

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