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Leases (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) Property | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Operating Leased Assets [Line Items] |  |  |  |
Fixed and in-substance fixed lease income |  | $ 797,502 | $ 807,603 | $ 813,444
Variable lease income |  | 262,619 | 247,384 | 247,861
Uncollectible straight line rent | [1] | 5,227 | (34,673) | (7,002)
Uncollectible amounts billable in lease income | [1] | 23,481 | (82,367) | (5,394)
Total lease income |  | 1,113,368 | 980,166 | 1,094,301
2022 |  | 793,177 |  |
2023 |  | 710,472 |  |
2024 |  | 609,200 |  |
2025 |  | 501,333 |  |
2026 |  | 398,196 |  |
Thereafter |  | 1,409,012 |  |
Total |  | $ 4,421,390 |  |
Number of Properties Subject to Ground Leases | Property |  | 20 |  |
Last Ground Lease Expiration Date |  | 2101 |  |
Last Office Lease Expiration Date |  | 2029 |  |
Operating Lease, Expense |  | $ 19,818 | 19,679 | 20,456
Variable Lease, Cost |  | 1,647 | 1,629 | 2,245
Operating cash flows for operating leases |  | 15,165 | 15,003 | 14,815
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months |  | 14,564 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two |  | 14,098 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three |  | 13,556 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four |  | 13,388 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five |  | 13,136 |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five |  | 529,436 |  |
Lessee, Operating Lease, Total Undiscounted Lease Liabilities |  | 598,178 |  |
Lessee, Operating Lease, Present Value Discount |  | (382,390) |  |
Lease liabilities |  | 215,788 | 220,390 |
Lessor [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Above/below market rent and tenant rent inducement amortization, net |  | 24,539 | 42,219 | 45,392
Ground Lease [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating Lease, Expense |  | 13,862 | 13,716 | 13,982
Variable Lease, Cost |  | 1,032 | 1,044 | 1,693
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months |  | 10,562 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two |  | 10,775 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three |  | 10,824 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four |  | 10,827 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five |  | 10,748 |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five |  | 527,860 |  |
Lessee, Operating Lease, Total Undiscounted Lease Liabilities |  | 581,596 |  |
Lessee, Operating Lease, Present Value Discount |  | (381,062) |  |
Lease liabilities |  | $ 200,534 |  |
Operating Lease, Weighted Average Discount Rate, Percent |  | 5.20% |  |
Operating Lease, Weighted Average Remaining Lease Term |  | 47 years 8 months 12 days |  |
Office Lease [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating Lease, Expense |  | $ 4,309 | 4,334 | 4,229
Variable Lease, Cost |  | 615 | 585 | 552
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months |  | 4,002 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two |  | 3,323 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three |  | 2,732 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four |  | 2,561 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five |  | 2,388 |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five |  | 1,576 |  |
Lessee, Operating Lease, Total Undiscounted Lease Liabilities |  | 16,582 |  |
Lessee, Operating Lease, Present Value Discount |  | (1,328) |  |
Lease liabilities |  | $ 15,254 |  |
Operating Lease, Weighted Average Discount Rate, Percent |  | 3.40% |  |
Operating Lease, Weighted Average Remaining Lease Term |  | 4 years 9 months 18 days |  |
Fixed Lease Expense [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating Lease, Expense |  | $ 18,171 | $ 18,050 | $ 18,211
[1] | During the year ended December 31, 2021, the Company had improved rent collections following decreases in governmental operating restrictions on certain businesses which resulted in more favorable income than we experienced in 2020 during the height of the pandemic.

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