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Accounting Policies Stock Option Assumptions (Tables)
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Dec. 31, 2012
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| Share-based Compensation [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Share-based Payment Award, Valuation Assumptions [Table Text Block] |
The fair value of non-vested shares issued were estimated using the closing market prices for the business day of the grant. The share-based compensation for the non-vested shares is recognized, net of estimated forfeitures, ratably over the requisite service period or vesting period. Forfeitures are estimated based on our historical experience, but will be adjusted for future changes in forfeiture experience.
The fair value of the performance shares was estimated using a Monte Carlo simulation. The share-based compensation for performance shares are recognized, net of estimated forfeitures, ratably over the requisite service period, or vesting period. The following table contains the weighted-average assumptions used to estimate the fair value of performance shares granted. These assumptions are highly subjective and changes in these assumptions can materially affect the fair value estimate.
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