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Stock-Based Compensation (Narrative) (Details)
9 Months Ended
Sep. 30, 2018
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period (in years) 4 years
PSU  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
PSU Cycle 3 years