Share-Based Compensation (Tables)
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Dec. 31, 2012
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Variables Used in Black-Scholes Option Pricing Model to Determine Estimated Grant Date Fair Value for Options Granted |
The following are the variables we used in the Black-Scholes option pricing model to determine the estimated grant date fair value for options granted under our 2009 and 1999 Long-Term Incentive Plans for each of the years presented:
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Summary of Option Activity |
The table below presents a summary of option activity under our 2009 and 1999 Long-Term Incentive Plans as of December 31, 2012, and changes during the year then ended:
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- Definition
Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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