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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-Based Compensation |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Aggregate | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic | ​
​ |  | Shares |  | Price |  | (Yrs.) |  | (000's) |
Outstanding at January 1, 2021 | ​ | 256,425 | ​ | $ | 59.01 | ​ | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (51,620) | ​ |  | 46.13 | ​ | ​ | ​ |  | ​ | ​
Forfeited | ​ | (6,107) | ​ | ​ | 86.45 | ​ | ​ | ​ |  | ​ | ​
Outstanding at September 30, 2021 | ​ | 198,698 | ​ |  | 61.52 | ​ | 4.07 | ​ | $ | 3,554 | ​
Exercisable at September 30, 2021 | ​ | 198,698 | ​ | ​ | 61.52 | ​ | 4.07 | ​ | $ | 3,554 | ​
Summary of nonvested restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant-Date |
Restricted Stock | ​ | Shares | ​ | Fair Value |
Nonvested at January 1, 2021 |  | 11,004 | ​ | $ | 59.42 | ​
Vested |  | (4,168) | ​ |  | 52.95 | ​
Nonvested at September 30, 2021 |  | 6,836 | ​ | $ | 63.37 | ​
Summary of nonvested RSUs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant-Date |
Restricted Stock Units | ​ | Shares | ​ | Fair Value |
Outstanding at January 1, 2021 |  | 750,821 | ​ | $ | 60.88 | ​
Granted |  | 298,338 | ​ |  | 81.16 | ​
Vested | ​ | (74,934) | ​ | ​ | 60.47 | ​
Forfeited | ​ | (10,126) | ​ | ​ | 62.37 | ​
Outstanding at September 30, 2021 |  | 964,099 | ​ | $ | 67.27 | ​

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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