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Stock-Based Compensation Narrative (Details)
shares in Thousands
9 Months Ended
Sep. 30, 2015
shares
Statement [Line Items]  
Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term 10 years
Directors' Plan [Member]  
Statement [Line Items]  
Shares reserved for future grants under the stock option and compensation plan 396
Employee Stock Option [Member]  
Statement [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 3 years
Shares reserved for future grants under the stock option and compensation plan 11,600