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Stock Options and Restricted Stock Awards - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Aug. 31, 2017
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise period for employee's vested options   90 days
Restricted Stock | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   1 year
Restricted Stock | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   3 years
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant Date Fair Value of Restricted Stock Awards, Market Conditions $ 3,587  
Performance Shares | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate shares based on thresholds measuring total shareholder return 251,479