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Leases - Supplemental balance sheet information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets [Abstract]    
Operating lease right of use asset $ 20,899  
Liabilities [Abstract]    
Operating lease current liability, included in other current liabilities 4,188  
Long-term lease liabilities 17,059
Total lease liabilities $ 21,247