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Leases - Summary of Operating Lease Liabilities (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Leases  
Operating lease liability, January 1, 2019 $ 10,809
Termination of existing qualifying leases (421)
Amortization of lease obligation (1,506)
Operating Lease liability, June 30, 2019 $ 8,882