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Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2005 | Sep. 30, 2018
Principal Repayments and Joint Venture Debt |  |
Remaining 2018 |  | $ 9,881,000
2019 |  | 158,271,000
2020 |  | 977,997,000
2021 |  | 361,638,000
2022 |  | 1,007,985,000
Thereafter |  | 3,113,258,000
Total principal repayments |  | $ 5,629,030,000
Trust Preferred Securities |  |
Debt Instrument [Line Items] |  |
Proceeds from issuance of debt | $ 100,000,000.0 |
LIBOR | Trust Preferred Securities |  |
Debt Instrument [Line Items] |  |
Interest rate added to base rate (as a percent) |  | 1.25%
Joint venture |  |
Principal Repayments and Joint Venture Debt |  |
Remaining 2018 |  | $ 2,568,000
2019 |  | 115,295,000
2020 |  | 276,822,000
2021 |  | 454,621,000
2022 |  | 220,810,000
Thereafter |  | 2,879,344,000
Total principal repayments |  | 3,949,460,000
Joint venture | Trust Preferred Securities |  |
Principal Repayments and Joint Venture Debt |  |
Remaining 2018 |  | 0
2019 |  | 0
2020 |  | 0
2021 |  | 0
2022 |  | 0
Thereafter |  | 100,000,000
Total principal repayments |  | 100,000,000
Joint venture | Mortgages and other loans payable |  |
Scheduled Amortization |  |
Remaining 2018 |  | 9,881,000
2019 |  | 42,271,000
2020 |  | 23,466,000
2021 |  | 11,638,000
2022 |  | 9,430,000
Thereafter |  | 16,591,000
Total amortization of debt |  | 113,277,000
Principal Repayments and Joint Venture Debt |  |
Remaining 2018 |  | 0
2019 |  | 116,000,000
2020 |  | 704,531,000
2021 |  | 0
2022 |  | 198,555,000
Thereafter |  | 1,251,667,000
Total principal repayments |  | 2,270,753,000
Joint venture | Revolving Credit Facility |  |
Principal Repayments and Joint Venture Debt |  |
Remaining 2018 |  | 0
2019 |  | 0
2020 |  | 0
2021 |  | 0
2022 |  | 0
Thereafter |  | 145,000,000
Total principal repayments |  | 145,000,000
Joint venture | Unsecured Term Loans |  |
Principal Repayments and Joint Venture Debt |  |
Remaining 2018 |  | 0
2019 |  | 0
2020 |  | 0
2021 |  | 0
2022 |  | 0
Thereafter |  | 1,500,000,000
Total principal repayments |  | 1,500,000,000
Joint venture | Senior Unsecured Notes |  |
Principal Repayments and Joint Venture Debt |  |
Remaining 2018 |  | 0
2019 |  | 0
2020 |  | 250,000,000
2021 |  | 350,000,000
2022 |  | 800,000,000
Thereafter |  | 100,000,000
Total principal repayments |  | $ 1,500,000,000

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