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Fair Value Measurements - Fair Value of Financial Instruments Presented at Carrying Values (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Value |  |
Debt Instrument [Line Items] |  |
Mortgages payable | $ 240,351 | $ 370,804
Unsecured term loans and revolving line of credit | 352,000 | 300,000
Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Mortgages payable | 236,433 | 372,962
Unsecured term loans and revolving line of credit | $ 352,276 | $ 299,770

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- Definition Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time. + References No definition available. + Details
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- Details
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