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Share-Based Compensation (Narrative) (Details) - $ / shares
9 Months Ended
Sep. 30, 2017
May 02, 2017
2012 Plan [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares available for grant under Stock Incentive Plan   0
Two Thousand Seventeen Plan    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares available for grant under Stock Incentive Plan 4,000,000  
Number of shares that may be granted under Stock Incentive Plan   4,000,000
Two Thousand Seventeen Plan | Restricted Stock Awards [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares issued 305,000  
Weighted-average grant date fair value per share $ 6.20