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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based compensation disclosures |
Stock option transactions under various stock-based employee compensation plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ |
​ | ​ | ​ | ​ | Weighted- | ​ | Average | ​ | ​ | ​ |
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate |
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic |
Options |  | Shares |  | Price |  | Term |  | Value |
​ | ​ | (In thousands, except exercise price) |
Options outstanding as of December 31, 2018 |  | 3,776 | ​ | $ | 11.36 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Granted |  | 138 | ​ |  | 2.60 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​ | ​
Surrendered |  | (2,269) | ​ |  | 9.83 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Forfeited |  | (15) | ​ |  | 9.18 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding as of December 31, 2019 |  | 1,630 | ​ | $ | 12.77 |  | 4.37 | years | ​ | $ | 119 | ​
Options exercisable as of December 31, 2019 |  | 1,630 | ​ | $ | 12.77 |  | 4.37 | years | ​ | $ | 119 | ​
Schedule of grant date fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2019 |  | 2018 |  | 2017 |
Weighted average fair value of options granted | ​ | $ | 1.07 | ​ | $ | 1.75 | ​ | $ | 2.86 | ​
Weighted average risk free interest rate | ​ |  | 1.79% | ​ |  | 2.59% | ​ |  | 1.85% | ​
Dividend yield | ​ |  | 1.65% | ​ |  | 3.03% | ​ |  | 2.94% | ​
Volatility (1) | ​ |  | 57.59% | ​ |  | 57.11% | ​ |  | 50.82% | ​
Expected life (in years) | ​ |  | 4.0 | ​ |  | 4.0 | ​ |  | 4.0 | ​
(1) | Expected volatilities are based on implied volatilities from publicly traded options to purchase Nabors' common shares, historical volatility of Nabors' common shares and other factors.
​
Unvested stock options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average |
​ | ​ | ​ | ​ | Grant-Date Fair |
Unvested Stock Options | ​ | Outstanding | ​ | Value |
​ | ​ | (In thousands, except fair value) |
Unvested as of December 31, 2018 |  | 17 | ​ | $ | 5.21 | ​
Granted |  | 138 | ​ |  | 1.07 | ​
Vested |  | (155) | ​ |  | 1.53 | ​
Forfeited | ​ | — | ​ | ​ | — | ​
Unvested as of December 31, 2019 |  | — | ​ | $ | — | ​
Restricted Stock |
Share-based compensation disclosures |
Unvested restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average |
​ | ​ | ​ | ​ | Grant-Date Fair |
Restricted shares | ​ | Outstanding | ​ | Value |
​ | ​ | (In thousands, except fair value) |
Unvested as of December 31, 2018 |  | 3,612 | ​ | $ | 9.16 | ​
Granted |  | 3,265 | ​ |  | 3.26 | ​
Vested |  | (1,444) | ​ |  | 9.66 | ​
Forfeited | ​ | (521) | ​ | ​ | 6.06 | ​
Unvested as of December 31, 2019 |  | 4,912 | ​ | $ | 5.42 | ​
Restricted Stock Based on Performance Conditions |
Share-based compensation disclosures |
Unvested restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average
​ | ​ | ​ | ​ | Grant-Date Fair
Performance based restricted shares | ​ | Outstanding | ​ | Value
​ | ​ | (In thousands, except fair value)
Outstanding as of December 31, 2018 | ​ | 1,746 | ​ | $ | 9.35
Granted |  | 2,413 |  | ​ | 3.10
Vested |  | (919) |  | ​ | 10.15
Outstanding as of December 31, 2019 |  | 3,240 | ​ | $ | 4.47
Restricted Stock Based on Market Conditions |
Share-based compensation disclosures |
Schedule of grant date fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, | ​
​ | ​ | 2019 |  | 2018 |  | 2017 |
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Risk free interest rate | ​ | ​ | 2.48% | ​ | ​ | 2.02% | ​ | ​ | 1.62% | ​
Expected volatility | ​ | ​ | 70.00% | ​ | ​ | 57.00% | ​ | ​ | 55.00% | ​
Closing stock price at grant date | ​ | $ | 2.19 | ​ | $ | 6.87 | ​ | $ | 16.81 | ​
Expected term (in years) | ​ | ​ | 3.0 | ​ | ​ | 3.0 | ​ |  | 3.0 | ​
Unvested restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average |
​ | ​ | ​ | ​ | Grant-Date Fair |
Market based restricted shares | ​ | Outstanding | ​ | Value |
​ | ​ | (In thousands, except fair value) |
Outstanding as of December 31, 2018 | ​ | 1,357 | ​ | $ | 7.09 |
Granted |  | 2,610 |  | ​ | 1.42 | ​
Vested |  | (188) |  | ​ | 5.58 | ​
Forfeited | ​ | (562) | ​ | ​ | 5.58 | ​
Outstanding as of December 31, 2019 |  | 3,217 | ​ | $ | 2.84 | ​

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for unvested share options (or share units) that were outstanding at the beginning and end of the year, the number of share options or share units that were granted, vested, and 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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