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Basis of Financial Reporting - Lease Liability Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]    
2019 (October 1 - December 31) $ 2,638  
2020 9,916  
2021 6,803  
2022 4,652  
2023 3,640  
2024 and thereafter 12,996  
Total lease payments 40,645  
Imputed interest (5,408)  
Total $ 35,237  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019   $ 9,181
2020   8,261
2021   5,776
2022   3,745
2023   2,904
2024 and thereafter   5,479
Total minimum lease payments   $ 35,346