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Leases - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease assets $ 11,718 $ 0
Operating lease current liabilities 2,257 0
Operating lease non-current liabilities 12,992 $ 0
Total lease liabilities $ 15,249  
Weighted-average remaining lease term 8 years 6 months  
Weighted-average discount rate 8.10%