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Leases - Income Relating to Lease Payments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Income relating to lease payments:  
Income from leases $ 256,250
Undiscounted Cash Flows  
2020 171,874
2021 169,399
2022 144,949
2023 129,900
2024 115,271
2025 and thereafter 360,408
Income relating to lease payments 1,091,801
Variable lease payments $ 64,421