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Leases - Narratives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Sep. 30, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Operating RoU Assets   $ 7,228  
Opoerating lease liability   $ 7,214  
Lease expense $ 4,900    
ASU 2016-02      
Lessee, Lease, Description [Line Items]      
Operating RoU Assets     $ 7,500
Opoerating lease liability     $ 7,500