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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes payable | $ 3,445,400 |  | $ 3,435,161
Unsecured credit facilities | 969,457 |  | 484,383
Trading Securities, Change in Unrealized Holding Gain (Loss) | (5,400) | $ 2,200 |
Impairment of Real Estate | (784) | $ (1,672) |
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 | 34,240 |  | 39,599
Available-for-sale Securities | 11,061 |  | 10,755
Total | 45,301 |  | 53,341
Interest Rate Cash Flow Hedge Liability at Fair Value | (10,420) |  | (1,515)
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | 2,987
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Operating properties |  |  | 71,131
Impairment of Real Estate |  |  | (50,553)
Fair Value Inputs Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes Payable, Fair Value | 3,611,169 |  | 3,688,604
Fair Value Inputs Level 2 [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 | 0 |  | 0
Available-for-sale Securities | 11,061 |  | 10,755
Total | 11,061 |  | 13,742
Interest Rate Cash Flow Hedge Liability at Fair Value | (10,420) |  | (1,515)
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | 2,987
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
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 | 960,796 |  | 489,496
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 | 34,240 |  | 39,599
Available-for-sale Securities | 0 |  | 0
Total | 34,240 |  | 39,599
Interest Rate Cash Flow Hedge Liability at Fair Value | 0 |  | 0
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | 0
Fair Value, Inputs, Level 3 [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 | 0 |  | 0
Available-for-sale Securities | 0 |  | 0
Total | 0 |  | 0
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 0 |  | 0
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | 0
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

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