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Fair Value Measurements (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes payable | $ 3,723,923,000 |  | $ 3,723,923,000 |  | $ 3,435,161,000
Unsecured credit facilities | 264,605,000 |  | 264,605,000 |  | 484,383,000
Trading Securities, Change in Unrealized Holding Gain (Loss) | 1,300,000 | $ (15,000) | 251,000 | $ 2,700,000 |
Impairment of Real Estate |  | $ 14,000 | (1,014,000) | $ (12,099,000) |
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 | 40,849,000 |  | 40,849,000 |  | 39,599,000
Available-for-sale Securities | 11,146,000 |  | 11,146,000 |  | 10,755,000
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  |  | 2,987,000
Total | 51,995,000 |  | 51,995,000 |  | 53,341,000
Interest Rate Cash Flow Hedge Liability at Fair Value | (10,417,000) |  | (10,417,000) |  | (1,515,000)
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Operating properties |  |  |  |  | 71,131,000
Impairment of Real Estate |  |  |  |  | (50,553,000)
Fair Value Inputs Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 4,072,114,000 |  | 4,072,114,000 |  | 3,688,604,000
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 | 11,146,000 |  | 11,146,000 |  | 10,755,000
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  |  | 2,987,000
Total | 11,146,000 |  | 11,146,000 |  | 13,742,000
Interest Rate Cash Flow Hedge Liability at Fair Value | (10,417,000) |  | (10,417,000) |  | (1,515,000)
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 |  |  |  |  | 28,131,000
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 | 264,075,000 |  | 264,075,000 |  | 489,496,000
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 | 40,849,000 |  | 40,849,000 |  | 39,599,000
Total | $ 40,849,000 |  | $ 40,849,000 |  | 39,599,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Operating properties |  |  |  |  | $ 43,000,000

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