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Derivative Financial Instruments - Floating-to-Fixed Interest Rate Swaps (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 938,714 | $ 874,606
Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | 339,859 |
Not designated as accounting hedges |  |
Derivative [Line Items] |  |
Notional amount | 264,480 | 200,000
Not designated as accounting hedges | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | 50,000 | 50,000
Not designated as accounting hedges | Senior Unsecured Term Loan 2.78% | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 50,000 |
Fixed interest rate | 2.78% |
Effective interest rate | 4.23% |
Designated as accounting hedge | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 289,859 | $ 290,231
Designated as accounting hedge | John Hopkins Village | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 50,609 |
Fixed interest rate | 2.94% |
Effective interest rate | 4.19% |
Designated as accounting hedge | Senior Unsecured Term Loan 3.02% | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 10,500 |
Fixed interest rate | 3.02% |
Effective interest rate | 4.47% |
Designated as accounting hedge | 249 Central Park Retail, South Retail, and Fountain Plaza Retail | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 33,750 |
Fixed interest rate | 2.25% |
Effective interest rate | 3.85% |
Designated as accounting hedge | Senior Unsecured Term Loan 2.26% | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 50,000 |
Fixed interest rate | 2.26% |
Effective interest rate | 3.71% |
Designated as accounting hedge | Thames Street Wharf | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 70,000 |
Fixed interest rate | 0.51% |
Effective interest rate | 1.81% |
Designated as accounting hedge | Senior Unsecured Term Loan 0.50%, Term Loan One | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 25,000 |
Fixed interest rate | 0.50% |
Effective interest rate | 1.95% |
Designated as accounting hedge | Senior Unsecured Term Loan 0.50%, Term Loan Two | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 25,000 |
Fixed interest rate | 0.50% |
Effective interest rate | 1.95% |
Designated as accounting hedge | Senior Unsecured Term Loan 0.55% | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 25,000 |
Fixed interest rate | 0.55% |
Effective interest rate | 2.00% |

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