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Leases - Lessor revenue and maturities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Income and Expenses, Lessor [Abstract]  
Lease revenue, ASC 842 $ 74,184
Operating Lease, Income, Comprehensive Income [Extensible List] Revenues
Sub-lessor rental income $ 38,300
Variable lease revenue 6,400
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]  
2020 63,012
2021 35,984
2022 19,787
2023 6,547
2024 4,445
Thereafter 11,114
Total to be received $ 140,889