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Stock Based Compensation (Details) - Class B [Member]
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Restricted [Member]  
Stock Based Compensation [Abstract]  
Shares distribution period from grant date 1 year
Restricted [Member] | 5/9/2017 [Member]  
Summary of stock Issuances [Abstract]  
Number of shares issued (in shares) 18,183
Vesting date May 09, 2018
Service period 7/1/2017 - 6/30/2018
Grant date fair value per share (in dollars per share) | $ / shares $ 24.20
Restricted [Member] | 8/31/2017 [Member]  
Summary of stock Issuances [Abstract]  
Number of shares issued (in shares) 1,257
Vesting date May 09, 2018
Service period 8/31/2017 - 6/30/2018
Grant date fair value per share (in dollars per share) | $ / shares $ 21.90
Restricted [Member] | 2/9/2018 [Member]  
Summary of stock Issuances [Abstract]  
Number of shares issued (in shares) 408
Vesting date May 09, 2018
Service period 2/9/2018 - 6/30/2018
Grant date fair value per share (in dollars per share) | $ / shares $ 24.20
Restricted [Member] | 5/8/2018 [Member]  
Summary of stock Issuances [Abstract]  
Number of shares issued (in shares) 19,085
Vesting date May 08, 2019
Service period 7/1/2018 - 6/30/2019
Grant date fair value per share (in dollars per share) | $ / shares $ 23.05
2017 LTIP Awards [Member] | Performance Based Equity Award [Member]  
Summary of stock Issuances [Abstract]  
Number of shares issued (in shares) 0
Vesting period 3 years
2017 VCIP Awards [Member] | Performance Based Equity Award [Member]  
Summary of stock Issuances [Abstract]  
Number of shares issued (in shares) 0
Performance period 3 years
2018 LTIP Awards [Member] | Performance Based Equity Award [Member]  
Summary of stock Issuances [Abstract]  
Performance period 1 year
Vesting period 3 years
2018 VCIP Awards [Member] | Performance Based Equity Award [Member]  
Summary of stock Issuances [Abstract]  
Performance period 3 years
Vesting period 3 years
Stock based compensation expense | $ $ 103