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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-Based Compensation |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Aggregate | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic | ​
​ |  | Shares |  | Price |  | (Yrs.) |  | (000's) |
Outstanding at January 1, 2020 | ​ | 176,888 | ​ | $ | 67.14 | ​ | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (12,485) | ​ |  | 32.33 | ​ | ​ | ​ |  | ​ | ​
Outstanding at March 31, 2020 | ​ | 164,403 | ​ |  | 69.78 | ​ | 5.39 | ​ | $ | 563 | ​
Exercisable at March 31, 2020 | ​ | 140,473 | ​ | ​ | 66.15 | ​ | 5.03 | ​ | $ | 562 | ​
Weighted-average fair value of options granted during the year | ​ | $0.00 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of nonvested restricted stock | Nonvested restricted stock for the three months ended March 31, 2020 is summarized in the following table. All information has been retroactively adjusted for stock dividends and stock splits. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant-Date |
Restricted Stock | ​ | Shares | ​ | Fair Value |
Nonvested at January 1, 2020 |  | 69,450 | ​ | $ | 58.96 | ​
Granted |  | 815 | ​ |  | 86.75 | ​
Vested |  | (37,359) | ​ |  | 72.65 | ​
Forfeited |  | (317) | ​ |  | 65.86 | ​
Nonvested at March 31, 2020 |  | 32,589 | ​ |  | 43.89 | ​
Summary of nonvested RSUs | Nonvested RSUs for the three months ended March 31, 2020 is summarized in the following table. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant-Date |
Restricted Stock Units | ​ | Shares | ​ | Fair Value |
Nonvested at January 1, 2020 |  | 324,601 | ​ | $ | 76.44 | ​
Granted |  | 19,424 | ​ |  | 86.14 | ​
Forfeited | ​ | (2,830) | ​ | ​ | 81.39 | ​
Nonvested at March 31, 2020 |  | 341,195 | ​ |  | 76.95 | ​

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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