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Capital Transactions (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Aggregate | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted |
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average |
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Value | ​ | Number of | ​ | Exercise | ​ | Number of | ​ | Exercise |
​ | ​ | Options | ​ | Price | ​ | Term | ​ | ($000) | ​ | Options | ​ | Price | ​ | Options | ​ | Price |
Outstanding at beginning of year |  | 60,231 | ​ |  | 14.74 |  | 3.1 | years | $ | 3,005.1 |  | 300,580 |  | $ | 13.70 |  | 458,103 |  | $ | 13.73 | ​
Granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ |  | — | ​ |  | — |  | — | ​ |  | — | ​
Exercised |  | (2,578) | ​ |  | 14.78 | ​ | ​ | ​ | ​ | ​ |  | (232,514) | ​ |  | 13.36 |  | (157,523) | ​ |  | 13.80 | ​
Cancelled |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ |  | (7,835) | ​ |  | 15.86 |  | — | ​ |  | — | ​
Outstanding at end of year |  | 57,653 | ​ |  | 14.74 |  | 2.1 | years | $ | 1,474.5 |  | 60,231 | ​ |  | 14.74 |  | 300,580 | ​ |  | 13.70 | ​
Exercisable at December 31, 2020 |  | 57,653 | ​ | ​ | 14.74 | ​ | 2.1 | years | $ | 1,474.5 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at December 31, 2019 |  | 60,231 | ​ | ​ | 14.74 | ​ | 3.1 | years | $ | 3,005.1 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of stock options outstanding | The following table summarizes information about the Company’s stock options outstanding at December 31, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Options Outstanding | ​ | Options Exercisable |
​ | ​ | ​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | ​ | ​ | Number | ​ | Remaining | ​ | Weighted Average | ​ | Number | ​ | Weighted Average |
Range of Exercise Prices | ​ | Outstanding | ​ | Contractual Life | ​ | Exercise Price | ​ | Exercisable | ​ | Exercise Price |
$13.00 | to | $13.99 |  | 2,034 |  | 0.1 | years |  | $ | 13.51 | ​ | 2,034 |  | $ | 13.51 | ​
$14.00 | to | $15.00 |  | 55,619 |  | 1.1 | years | ​ |  | 14.78 |  | 55,619 | ​ |  | 14.78 | ​
$13.00 | to | $15.00 |  | 57,653 |  | 1.1 | years | ​ | $ | 14.74 |  | 57,653 | ​ | $ | 14.74 | ​
Schedule of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | Weighted-Average |
​ | ​ | ​ | ​ | ​ | Grant-Date Fair |
​ | ​ | Number of RSUs | ​ | ​ | Value |
Non-vested RSUs outstanding at December 31, 2017 |  | 815,590 | ​ | $ | 18.35 | ​
Granted |  | 115,044 | ​ |  | 53.40 | ​
Vested |  | (330,580) | ​ |  | 13.57 | ​
Cancelled |  | (24,273) | ​ |  | 27.77 | ​
Non-vested RSUs outstanding at December 31, 2018 |  | 575,781 | ​ | $ | 27.71 | ​
Granted |  | 104,120 | ​ |  | 48.65 | ​
Vested |  | (251,853) | ​ |  | 14.79 | ​
Cancelled |  | (143,362) | ​ |  | 30.85 | ​
Non-vested RSUs outstanding at December 31, 2019 |  | 284,686 | ​ | $ | 45.21 | ​
Granted |  | 82,505 | ​ |  | 61.45 | ​
Vested |  | (103,231) | ​ |  | 35.81 | ​
Cancelled |  | (25,983) | ​ |  | 52.31 | ​
Non-vested RSUs outstanding at December 31, 2020 |  | 237,977 | ​ | $ | 54.15 | ​
Performance stock units |
Schedule of non-vested stock options | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | Weighted-Average
​ | ​ | ​ | ​ | ​ | Grant-Date
​ | ​ | Number of PSUs | ​ | ​ | Fair Value
Non-vested PSUs outstanding at December 31, 2017 |  | 468,576 | ​ | $ | 19.70
Granted |  | 90,264 | ​ |  | 53.41
Additional PSUs awarded from the 2015 grant |  | 92,335 | ​ |  | 13.62
Vested |  | (277,029) | ​ |  | 13.62
Cancelled |  | (3,229) | ​ |  | 30.09
Non-vested PSUs outstanding at December 31, 2018 |  | 370,917 | ​ | $ | 30.84
Granted |  | 87,864 | ​ |  | 48.81
Additional PSUs awarded from the 2016 grant |  | 67,853 | ​ |  | 14.80
Vested |  | (203,582) | ​ |  | 14.80
Cancelled |  | (89,481) | ​ |  | 34.70
Non-vested PSUs outstanding at December 31, 2019 |  | 233,571 | ​ | $ | 45.44
Granted |  | 69,132 | ​ |  | 61.45
Additional PSUs awarded from the 2017 grant |  | 83,042 | ​ |  | 35.81
Vested |  | (166,084) | ​ |  | 35.81
Cancelled |  | (23,052) | ​ |  | 53.66
Non-vested PSUs outstanding at December 31, 2020 |  | 196,609 | ​ | $ | 54.17

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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=120381028&loc=d3e5070-113901 + Details
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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=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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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