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Leases - Schedule of Operating and Finance Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets:    
Operating lease assets $ 17,082 $ 0
Finance lease assets 536  
Total leased assets 17,618  
Liabilities:    
Operating lease liabilities 17,862 $ 0
Finance lease liabilities 666  
Total leased liabilities 18,528  
Finance lease, net of accumulated amortization $ 680