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Share Incentive Plans, Equity Incentive Plans (Details) - shares
Sep. 30, 2019
Apr. 28, 2016
2015 Plan [Member]    
Share Incentive Plans [Abstract]    
Number of shares available for grant (in shares) 582,869  
2015 Plan [Member] | Restricted Stock [Member]    
Share Incentive Plans [Abstract]    
Number of awards granted (in shares) 16,159  
2015 Plan [Member] | Performance-Based Restricted Stock Units [Member]    
Share Incentive Plans [Abstract]    
Number of awards granted (in shares) 359,008  
2015 Plan [Member] | Stock Options [Member]    
Share Incentive Plans [Abstract]    
Number of awards granted (in shares) 441,964  
2015 Plan [Member] | Voting Common Stock [Member]    
Share Incentive Plans [Abstract]    
Number of shares authorized for issuance (in shares)   1,400,000
2006 Plan [Member]    
Share Incentive Plans [Abstract]    
Number of shares available for grant (in shares) 0