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Stock-Based Compensation Plans (Tables)
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6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of restricted stock activity | The following is a summary of restricted stock activity for the six months ended June 30, 2013:
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| Summary of performance based share grants | The following is a summary of performance-based share grants for the six months ended June 30, 2013:
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| Summary of the changes in outstanding stock options | The following is a summary of the changes in outstanding stock options for the six months ended June 30, 2013:
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| Weighted-average assumptions for annual March 2012 grants | The fair value of each option grant was estimated on the date of grant using the binomial lattice pricing model which incorporates multiple and variable assumptions over time, including assumptions such as employee exercise patterns, stock price volatility and changes in dividends. The following are weighted-average assumptions for our annual March grants in 2013.
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