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Leases (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) property | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) property | Sep. 30, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items] |  |  |  |  |  |
Fixed and in-substance fixed lease income | $ 203,407 |  | $ 602,698 |  |  |
Variable lease income | 59,872 |  | 185,317 |  |  |
Above/below market rent amortization |  |  | (30,196) | $ (26,031) |  |
Uncollectible amounts in lease income | (2,222) |  | (3,667) |  |  |
Total lease income | 272,143 | $ 268,948 | 815,682 | 808,661 |  |
Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year | 198,877 |  | 198,877 |  |  | $ 761,151
Lessor, Operating Lease, Payments to be Received, Two Years | 765,960 |  | 765,960 |  |  | 693,848
Lessor, Operating Lease, Payments to be Received, Three Years | 685,457 |  | 685,457 |  |  | 608,587
Lessor, Operating Lease, Payments to be Received, Four Years | 593,471 |  | 593,471 |  |  | 516,369
Lessor, Operating Lease, Payments to be Received, Five Years | 489,035 |  | 489,035 |  |  | 414,424
Lessor, Operating Lease, Payments to be Received, Thereafter | 1,925,998 |  | 1,925,998 |  |  | 1,691,203
Lessor, Operating Lease, Payments to be Received | $ 4,658,798 |  | $ 4,658,798 |  |  | 4,685,582
Number of Properties Subject to Ground Leases | property | 22 |  | 22 |  |  |
Last Ground Lease Expiration Date |  |  | 2101 |  |  |
Last Office Lease Expiration Date |  |  | 2029 |  |  |
Operating Lease, Expense | $ 5,081 | $ 5,000 | $ 15,533 | $ 14,200 |  |
Variable Lease, Cost | 501 |  | 1,646 |  |  |
Operating cash flows for operating leases | 3,684 |  | 11,096 |  |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 3,949 |  | 3,949 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two | 15,786 |  | 15,786 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three | 14,643 |  | 14,643 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four | 13,700 |  | 13,700 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five | 13,215 |  | 13,215 |  |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 570,424 |  | 570,424 |  |  |
Lessee, Operating Lease, Total Undiscounted Lease Liabilities | 631,717 |  | 631,717 |  |  |
Lessee, Operating Lease, Present Value Discount | (408,136) |  | (408,136) |  |  |
Lease liabilities | 223,581 |  | 223,581 |  | $ 225,400 | 0
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  |  |  |  | 15,077
Operating Leases, Future Minimum Payments, Due in Two Years |  |  |  |  |  | 14,733
Operating Leases, Future Minimum Payments, Due in Three Years |  |  |  |  |  | 13,893
Operating Leases, Future Minimum Payments, Due in Four Years |  |  |  |  |  | 13,151
Operating Leases, Future Minimum Payments, Due in Five Years |  |  |  |  |  | 12,558
Operating Leases, Future Minimum Payments, Due Thereafter |  |  |  |  |  | 467,706
Operating Leases, Future Minimum Payments Due |  |  |  |  |  | 537,118
Lessor [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Above/below market rent amortization | 11,086 |  | 31,334 |  |  |
Ground Lease [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating Lease, Expense | 3,514 |  | 10,714 |  |  |
Variable Lease, Cost | 364 |  | 1,236 |  |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 2,668 |  | 2,668 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two | 10,707 |  | 10,707 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three | 10,674 |  | 10,674 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four | 10,698 |  | 10,698 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five | 10,914 |  | 10,914 |  |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 564,080 |  | 564,080 |  |  |
Lessee, Operating Lease, Total Undiscounted Lease Liabilities | 609,741 |  | 609,741 |  |  |
Lessee, Operating Lease, Present Value Discount | (405,850) |  | (405,850) |  |  |
Lease liabilities | $ 203,891 |  | $ 203,891 |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 5.20% |  | 5.20% |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 49 years 4 months 24 days |  | 49 years 4 months 24 days |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  |  |  |  | 10,672
Operating Leases, Future Minimum Payments, Due in Two Years |  |  |  |  |  | 10,439
Operating Leases, Future Minimum Payments, Due in Three Years |  |  |  |  |  | 10,344
Operating Leases, Future Minimum Payments, Due in Four Years |  |  |  |  |  | 10,258
Operating Leases, Future Minimum Payments, Due in Five Years |  |  |  |  |  | 10,369
Operating Leases, Future Minimum Payments, Due Thereafter |  |  |  |  |  | 461,762
Operating Leases, Future Minimum Payments Due |  |  |  |  |  | 513,844
Office Lease [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating Lease, Expense | $ 1,066 |  | $ 3,173 |  |  |
Variable Lease, Cost | 137 |  | 410 |  |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 1,281 |  | 1,281 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two | 5,079 |  | 5,079 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three | 3,969 |  | 3,969 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four | 3,002 |  | 3,002 |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five | 2,301 |  | 2,301 |  |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 6,344 |  | 6,344 |  |  |
Lessee, Operating Lease, Total Undiscounted Lease Liabilities | 21,976 |  | 21,976 |  |  |
Lessee, Operating Lease, Present Value Discount | (2,286) |  | (2,286) |  |  |
Lease liabilities | $ 19,690 |  | $ 19,690 |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.90% |  | 3.90% |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 5 years 8 months 12 days |  | 5 years 8 months 12 days |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  |  |  |  | 4,405
Operating Leases, Future Minimum Payments, Due in Two Years |  |  |  |  |  | 4,294
Operating Leases, Future Minimum Payments, Due in Three Years |  |  |  |  |  | 3,549
Operating Leases, Future Minimum Payments, Due in Four Years |  |  |  |  |  | 2,893
Operating Leases, Future Minimum Payments, Due in Five Years |  |  |  |  |  | 2,189
Operating Leases, Future Minimum Payments, Due Thereafter |  |  |  |  |  | 5,944
Operating Leases, Future Minimum Payments Due |  |  |  |  |  | $ 23,274
Fixed Lease Expense [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating Lease, Expense | $ 4,580 |  | $ 13,887 |  |  |

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