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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2013
Share-Based Compensation |
Fair value of stock options weighted-average assumptions |
|  | Six Months Ended June 30, |
|  | 2013 |  | 2012 |
Weighted average fair value of options granted |  | $ | 6.25 |  | $ | 9.52 |
Weighted average risk free interest rate |  | 0.64 | % | 0.63 | %
Dividend yield |  | 0.78 | % | 0.00 | %
Volatility (1) |  | 51.01 | % | 55.91 | %
Expected life |  | 4.0 years |  | 4.0 years |
(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.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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