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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock Based Compensation |
Restricted shares and restricted share units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |
​ | ​ | Number of | ​ | Average |
​ | ​ | Restricted | ​ | Grant-Date |
​ | ​ | Shares | ​ | Fair Value |
​ | ​ | (thousands) | ​ | (per share) |
Nonvested at January 1, 2020 |  | 1,112 | ​ | $ | 19.69 | ​
Granted |  | 1,270 | ​ | ​ | 8.79 | ​
Vested |  | (457) | ​ | ​ | 19.06 | ​
Forfeited |  | (200) | ​ | ​ | 13.84 | ​
Nonvested at December 31, 2020 |  | 1,725 | ​ |  | 12.54 | ​
Awards granted during 2019 | ​ | ​ | ​ | $ | 19.69 | ​
Awards granted during 2018 | ​ | ​ | ​ | $ | 22.05 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018 |
Total fair value of shares vested | ​ | $ | 9 | ​ | $ | 8 | ​ | $ | 10 | ​
Performance vested restricted share unit activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of Performance |  | Weighted Average |
​ | ​ | Vested Restricted Shares | ​ | Grant-Date Fair Value |
​ | ​ | Units (thousands) | ​ | (per unit) |
Nonvested at January 1, 2020 |  | 1,559 | ​ | $ | 20.20 | ​
Granted |  | 1,422 | ​ |  | 9.92 | ​
Vested |  | (401) | ​ |  | 19.53 | ​
Forfeited/Cancelled |  | (289) | ​ |  | 14.68 | ​
Nonvested at December 31, 2020 |  | 2,291 | ​ |  | 14.63 | ​
Awards granted during 2019 | ​ | ​ | ​ | $ | 20.20 | ​
Awards granted during 2018 | ​ | ​ | ​ | $ | 19.73 | ​

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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 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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