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Stock Incentive Plans and Stock Purchase Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Restricted Stock and Deferred Stock Awards | The activity related to the Company’s restricted stock and deferred stock awards and the corresponding weighted average grant-date fair values for the year ended December 31, 2020 are as follows:​​​​​​​
|  | Number of Shares |  |  | Weighted Average Fair Value |
Non-vested shares at January 1, 2020 |  |  | 1,723,115 |  |  | $ | 40.77 |
Awarded |  |  | 1,361,712 |  |  | $ | 23.54 |
Forfeited |  |  | (173,455 | ) |  | $ | 31.68 |
Vested |  |  | (1,700,255 | ) |  | $ | 34.88 |
Non-vested shares at December 31, 2020 |  |  | 1,211,117 |  |  | $ | 30.97 |
Schedule of Activity and Certain Other Information Related to Stock Option Awards | The activity and certain other information related to the Company’s outstanding stock option awards for the year ended December 31, 2020 are as follows:
|  | Number of Stock Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Outstanding at January 1, 2020 |  |  | 72,808 |  |  | $ | 32.49 |  |  |  |  |  |  |  |  |
Awarded |  |  | 982,731 |  |  | $ | 16.99 |  |  |  |  |  |  |  |  |
Expired |  |  | (56,248 | ) |  | $ | 31.39 |  |  |  |  |  |  |  | — |
Outstanding at December 31, 2020 |  |  | 999,291 |  |  | $ | 17.30 |  |  |  | 2.58 |  |  | $ | 7.4 |
Exercisable at December 31, 2020 |  |  | 16,560 |  |  | $ | 36.25 |  |  |  | 0.34 |  |  |  | — |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -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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