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Stock-Based Compensation (Details 5) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Summary of the accumulated stock units |  |
Accumulated stock units | 55,390 | 51,190
Average price | $ 33.98 | $ 33.21

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- Definition Deferred compensation arrangement with individual accumulated stock units for deferred board fees. + References No definition available. + Details
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- Definition Deferred compensation arrangement with individual stock average price. + References No definition available. + Details
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