EMPLOYEE STOCK BENEFIT PLANS
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Jun. 30, 2011
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Employee Stock Benefit Plans [Text Block] | Note 13. EMPLOYEE STOCK BENEFIT PLANS
Stock-based compensation expense was as follows:
In the six months ended June 30, 2011, 3.1 million restricted stock units, 1.4 million market share units and 1.6 million long-term performance share units were granted. The weighted-average grant date fair value for restricted stock units, market share units and long-term performance share units granted during the six months ended June 30, 2011 was $ 25.68, $ 25.83 and $ 25.30, respectively.
Restricted stock units vest ratably over a four year period. Market share units vest ratably over a four year period based on share price performance. The fair value of market share units was estimated on the date of grant using a model applying multiple input variables that determine the probability of satisfying market conditions. Long-term performance share units are determined based on the achievement of annual performance goals, but are not vested until the end of the three year period. Total compensation costs related to nonvested awards not yet recognized and the weighted-average period over which such awards are expected to be recognized at June 30, 2011 were as follows:
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