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Leases - Present Value of Operating Lease Liabilities (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Remainder of 2019 $ 50,778
2020 67,626
2021 66,495
2022 59,443
2023 57,828
Thereafter 168,038
Total lease payments 470,208
Less: Imputed interest (94,837)
Present value of lease liabilities $ 375,371