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Leases (Details) - USD ($)
$ in Thousands
6 Months Ended
Jan. 01, 2019
Jun. 30, 2019
Leases    
Adoption of lease accounting standard   $ (86)
Operating lease right-of-use assets   11,843
Operating lease liabilities   $ 12,177
Existence of option to extend   true
Existence of residual value guarantees   false
Adjustment    
Leases    
Adoption of lease accounting standard $ 86  
ASU 2016-02 Leases    
Leases    
Operating lease right-of-use assets 12,200  
Operating lease liabilities 12,700  
ASU 2016-02 Leases | Adjustment    
Leases    
Adoption of lease accounting standard $ (86)