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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Compensation |
Schedule of status of and changes in the Company's stock option awards | A summary of the status of and changes in the Company's stock option awards for the six months ended June 30, 2020 follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Weighted-
​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | Remaining Contractual
​ |  | Shares |  | Price |  | Term
Outstanding at beginning of period |  | 53,185 |  | $ | 22.00 | ​ | ​
Exercised |  | (12,956) | ​ |  | 22.73 | ​ | ​
Forfeited |  | — | ​ | ​ | — | ​ | ​
Expired |  | (704) | ​ |  | 19.98 | ​ | ​
Outstanding at end of period |  | 39,525 |  | $ | 23.53 |  | 6.38
Exercisable at end of period |  | 39,525 |  | $ | 23.53 |  | 6.38
Summary of the changes in company deferred stock units | A summary of the changes in the Company’s stock unit awards for the six months ended June 30, 2020, is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Director | ​ | Weighted-
​ | ​ | Restricted | ​ | Average | ​ | Deferred | ​ | Average
​ | ​ | Stock | ​ | Grant Date | ​ | Stock | ​ | Grant Date
​ |  | Units |  | Fair Value |  | Units |  | Fair Value
Non-vested at beginning of period |  | 778,317 |  | $ | 27.27 |  | 21,261 |  | $ | 23.18
Granted |  | 3,808 | ​ |  | 26.26 |  | — | ​ |  | —
Dividend equivalents earned |  | 16,167 | ​ |  | 20.92 |  | 1,912 | ​ |  | 20.91
Vested |  | (117,641) | ​ |  | 21.38 |  | (23,173) | ​ |  | 26.29
Forfeited |  | (13,522) | ​ |  | 28.45 |  | — | ​ |  | —
Non-vested at end of period |  | 667,129 |  | $ | 28.13 |  | — |  | $ | —
Outstanding at end of period |  | 667,129 |  | $ | 28.13 |  | 69,406 |  | $ | 24.47

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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 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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