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Fair Value Measurements (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes payable | $ 3,749,273,000 |  | $ 3,749,273,000 |  | $ 3,658,405,000
Unsecured credit facilities |  |  |  |  | 264,679,000
Trading Securities, Change in Unrealized Holding Gain (Loss) | (1,500,000) | $ 1,300,000 | 217,000 | $ 251,000 |
Impairment of Real Estate | 20,000 |  | (115,000) | $ (1,014,000) |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 47,353,000 |  | 47,353,000 |  | 44,986,000
Available-for-sale Securities | 15,605,000 |  | 15,605,000 |  | 15,706,000
Total | 62,958,000 |  | 62,958,000 |  | 60,692,000
Interest Rate Cash Flow Hedge Liability at Fair Value | (4,265,000) |  | (4,265,000) |  | (9,291,000)
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Operating properties |  |  |  |  | 25,000,000
Impairment of Real Estate |  |  |  |  | (17,532,000)
Fair Value Inputs Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes payable, Fair Value | 4,171,212,000 |  | 4,171,212,000 |  | 4,102,382,000
Fair Value Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale Securities | 15,605,000 |  | 15,605,000 |  | 15,706,000
Total | 15,605,000 |  | 15,605,000 |  | 15,706,000
Interest Rate Cash Flow Hedge Liability at Fair Value | (4,265,000) |  | (4,265,000) |  | (9,291,000)
Fair Value Inputs Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Operating properties |  |  |  |  | 25,000,000
Fair Value Inputs Level 2 [Member] | Unsecured Credit Facilities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured credit facilities, Fair Value |  |  |  |  | 265,226,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 47,353,000 |  | 47,353,000 |  | 44,986,000
Total | $ 47,353,000 |  | $ 47,353,000 |  | $ 44,986,000

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