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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes payable | $ 3,652,242 |  | $ 3,658,405
Unsecured credit facilities |  |  | 264,679
Trading Securities, Change in Unrealized Holding Gain (Loss) | 400 | $ (5,400) |
Impairment of Real Estate |  | $ (784) | 17,500
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 | 45,337 |  | 44,986
Available-for-sale Securities | 15,656 |  | 15,706
Total | 60,993 |  | 60,692
Interest Rate Cash Flow Hedge Liability at Fair Value | (4,616) |  | (9,291)
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Operating properties |  |  | 25,000
Impairment of Real Estate |  |  | (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 | 3,943,126 |  | 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 | 15,656 |  | 15,706
Total | 15,656 |  | 15,706
Interest Rate Cash Flow Hedge Liability at Fair Value | (4,616) |  | (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 | 45,337 |  | 44,986
Total | $ 45,337 |  | $ 44,986

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