Mortgage Loans Payable and Unsecured Credit Facilities (Effect of Derivative Financial Instruments on Consolidated Statements of Operations and Consolidated Statements of Equity) (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Designation/Cash Flow [Member] | Interest Rate Swap [Member] | |||
| Derivative Instruments Gain Loss [Line Items] | |||
| Gain (loss) recognized in other comprehensive (loss) income (effective portion) | $ (4,148,000) | $ (17,940,000) | $ (13,090,000) |
| Continuing Operations [Member] | |||
| Derivative Instruments Gain Loss [Line Items] | |||
| (Loss) gain recognized in other comprehensive (loss) income reclassified into earnings (effective portion) | $ (6,476,000) | $ (6,062,000) | $ 1,196,000 |