Stock Compensation - Restricted Stock and Performance Share Grants (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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Stock Compensation - Restricted Stock and Performance Share Grants [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Summary of performance share grants with performance conditions | The following is a summary of the Company's performance share grants with performance conditions for the year ended December 31, 2014:
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Summary of stock grant activity | The following is a summary of the Company’s stock grant activity, both time and performance unit grants, assuming target achievement for outstanding performance grants for the following twelve month periods ended:
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Summary of stock compensation costs for Employee and NDSI Plans | The following table summarizes stock compensation costs for the Company's 1998 Stock Incentive Plan, or the Employee 1998 Plan, and NDSI Plan for the following periods:
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