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Lessee Leases - Maturity Schedule of Future Minimum Lease Payments under Operating Leases Prior to the Adoption of the New Lease Accounting Standard (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 14,153
2020 13,104
2021 12,729
2022 11,809
2023 8,334
Thereafter 27,289
Total minimum future lease payments $ 87,418