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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share Based Compensation |
Summary of activity for vested and unvested stock options outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted-average | ​ | ​ |
​ | ​ | Number | ​ | Weighted-average | ​ | remaining | ​ | Aggregate |
​ | ​ | of shares | ​ | exercise price | ​ | contractual term | ​ | intrinsic value |
​ |  | under option |  | per share |  | (years) |  | (in millions) |
Outstanding at January 1, 2019 | ​ | 3,767,483 | ​ | $ | 21.56 | ​ | 6.84 | ​ | $ | — | ​
Granted | ​ | 1,594,528 | ​ | ​ | 8.35 | ​ | — | ​ | ​ | — | ​
Forfeited | ​ | (201,596) | ​ | ​ | 30.93 | ​ | — | ​ | ​ | — | ​
Expired | ​ | (295,990) | ​ | ​ | 60.33 | ​ | — | ​ | ​ | — | ​
Outstanding at December 31, 2019 | ​ | 4,864,425 | ​ | $ | 14.48 | ​ | 7.34 | ​ | $ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested and exercisable at December 31, 2019 | ​ | 2,212,911 | ​ | $ | 20.88 | ​ | 5.85 | ​ | $ | — | ​
Service awards |
Share Based Compensation |
Summary of unvested deferred units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number | ​ | Weighted-average |
​ | ​ | of | ​ | grant-date fair value |
​ |  | units |  | per unit |
Unvested at January 1, 2019 | ​ | 4,077,992 | ​ | $ | 10.40 |
Granted | ​ | 3,044,494 | ​ | ​ | 8.33 | ​
Vested | ​ | (2,224,030) | ​ | ​ | 10.40 | ​
Forfeited | ​ | (178,878) | ​ | ​ | 9.01 | ​
Unvested at December 31, 2019 | ​ | 4,719,578 | ​ | $ | 9.11 | ​
Performance awards |
Share Based Compensation |
Summary of unvested deferred units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Number | ​ | Weighted-average |
​ | ​ | ​ | ​ | ​ | ​ | ​ | of | ​ | grant-date fair value |
​ |  | ​ | ​ | ​ | ​ | ​ | units |  | per unit |
Unvested at January 1, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | 1,763,794 | ​ | $ | 12.93 | ​
Granted | ​ | ​ | ​ | ​ | ​ | ​ | 1,067,316 | ​ | ​ | 10.77 | ​
Vested | ​ | ​ | ​ | ​ | ​ | ​ | (676,098) | ​ | ​ | 16.25 | ​
Forfeited | ​ | ​ | ​ | ​ | ​ | ​ | (73,393) | ​ | ​ | 3.02 | ​
Unvested at December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | 2,081,619 | ​ | $ | 10.78 | ​

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- Definition Disclosure of the number and weighted-average grant date fair value for deferred units that were outstanding at the beginning and end of the year, and the number of deferred units that were granted, vested, or forfeited during the year. + References No definition available. + 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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