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Fair Value Measurements (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes payable | $ 3,718,944 | $ 3,658,405 |
Unsecured credit facilities |  | 264,679 |
Trading Securities, Change in Unrealized Holding Gain (Loss) | (1,700) | 3,000 | $ 3,800
Impairment of Real Estate | (84,389) | (18,536) | $ (54,174)
Impairment of Real Estate |  | 17,500 |
Potrero Shopping Centers [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of Real Estate | 84,300 |  |
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 | 49,513 | 44,986 |
Available-for-sale Securities | 15,599 | 15,706 |
Total | 65,112 | 60,692 |
Interest Rate Cash Flow Hedge Liability at Fair Value | (2,858) | (9,291) |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Operating properties | 140,500 | 25,000 |
Impairment of Real Estate | (84,277) | (17,532) |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes Payable, Fair Value | 4,103,533 | 4,102,382 |
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 | 15,599 | 15,706 |
Total | 15,599 | 15,706 |
Interest Rate Cash Flow Hedge Liability at Fair Value | (2,858) | (9,291) |
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 |
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 |
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 | 49,513 | 44,986 |
Total | $ 49,513 | $ 44,986 |
Fair Value, Inputs, Level 3 [Member] | Discount Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Alternative Investment Rate | 0.072 |  |
Fair Value, Inputs, Level 3 [Member] | Terminal Capitalization Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Alternative Investment Rate | 0.0525 |  |
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 | $ 140,500 |  |

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