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Fair Value Measurements - Fair Value of Financial Instruments Presented at Carrying Values (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Value |  |
Debt Instrument [Line Items] |  |
Mortgages payable | $ 332,630 | $ 370,804
Line of credit and term loan | 300,000 | 300,000
Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Mortgages payable | 331,909 | 372,962
Line of credit and term loan | $ 299,791 | $ 299,770

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Definition Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates. + References No definition available. + Details
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- Details
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- Details
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