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Leases - Operating Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Lease assets $ 10,964 $ 0
Current lease liabilities (989) 0
Non-current lease liabilities (10,489) $ 0
Total lease liabilities $ (11,478)