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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock-Based Compensation Plans |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | Aggregate
​ | ​ | Option | ​ | Weighted Average | ​ | Contractual Term | ​ | Intrinsic Value
Stock Options |  | Shares |  | Exercise Price |  | (in years) |  | (in millions)
Outstanding at January 1, 2017 | ​ | 180,680 | ​ | $ | 52.61 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (98,405) | ​ | ​ | 52.41 | ​ | ​ | ​ | ​ | ​
Expired or forfeited | ​ | (7,000) | ​ | ​ | 58.68 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2017 | ​ | 75,275 | ​ | ​ | 52.30 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (48,275) | ​ | ​ | 57.91 | ​ | ​ | ​ | ​ | ​
Expired or forfeited | ​ | (1,000) | ​ | ​ | 55.73 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2018 | ​ | 26,000 | ​ | ​ | 41.76 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (20,000) | ​ | ​ | 40.80 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2019 | ​ | 6,000 | ​ | $ | 44.99 | ​ | 0.4 | ​ | $ | 0.4
Exercisable at December 31, 2019 | ​ | 6,000 | ​ | $ | 44.99 | ​ | 0.4 | ​ | $ | 0.4
Summary of certain information concerning outstanding and exercisable options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​
​ | ​ | Outstanding and | ​ | Remaining | ​ | Weighted Average
Range of | ​ | Exercisable at | ​ | Contractual Term | ​ | Exercise Price
Exercise Price |  | December 31, 2019 |  | (in years) |  | Per Share
$44 - $45 | ​ | 6,000 | ​ | 0.4 | ​ | $ | 44.99
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of the status of the Company's restricted stock units and changes during the year | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
Unvested RSUs | ​ | Shares |  | Per RSU
Unvested at January 1, 2019 | ​ | 889,830 | ​ | $ | 82.05
Granted | ​ | 488,345 | ​ | ​ | 88.05
Vested | ​ | (476,634) | ​ | ​ | 80.18
Canceled or forfeited | ​ | (42,536) | ​ | ​ | 83.97
Unvested at December 31, 2019 | ​ | 859,005 | ​ | $ | 86.40

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -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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