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Leases - Schedule of leases assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Assets:    
Operating lease right-of-use assets $ 16,659 $ 18,992
Liabilities:    
Operating leases, short-term 6,217 6,387
Operating leases, long-term 14,126 16,822
Total lease liabilities $ 20,343 $ 23,209