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Leases - Maturities of the Company's lease liabilities (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Operating Leases  
2019 (excluding the three months ended March 31, 2019) $ 12,804
2020 3,643
2021 1,140
2022 2,297
2023 2,345
Thereafter 12,801
Total future lease payments 35,030
Less: Imputed interest 4,288
Present value of future lease payments 30,742
Finance Leases  
2019 (excluding the three months ended March 31, 2019) 1,880
2020 2,495
2021 1,658
2022 888
2023 63
Thereafter 361
Total future lease payments 7,345
Less: Imputed interest 514
Present value of future lease payments $ 6,831