Stock-Based Compensation (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2015 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Summary of Stock Option Activity Under the Plan | The following is a summary of stock option activity under the 2007 and 2006 Plans for the year ended 2015:
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Summary of Restricted and Performance Unit Activity Under the Plan | The following is a summary of restricted and performance unit activity under the 2007 and 2006 Plans for the year ended 2015:
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Estimated Annual Stock-Based Compensation Expense | The estimated annual stock-based compensation expense as of December 31, 2015 for each of the succeeding years is indicated in the table below:
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