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Share-based Compensation - Restricted Stock (Details) - Restricted stock - shares
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Stock options, restricted stock and performance stock options    
Shares issued 0 0
Vested restricted stock awards settled (in shares) 0  
Unvested restricted stock outstanding (in shares) 0 0
Shares granted 0  
Shares forfeited 0