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Options and Awards Lead Paragraphs (Details)
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
shares
Sep. 30, 2017
shares
Stock Issued or Granted During Period, Share-based Compensation [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years
2017 Plan [Member] [Member]    
Stock Issued or Granted During Period, Share-based Compensation [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 6,458 6,458
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 6,881 6,881
Share-based Compensation Arrangement by Share-based Payment Award, Options, Conversion to Reduce Shares Availability 1  
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Conversion to Reduce Shares Availability 2.5  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years  
Director [Member] | 2017 Plan [Member] [Member]    
Stock Issued or Granted During Period, Share-based Compensation [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years