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Fair Value Measurements - Available for Sale (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Recurring | Level 2 | Interest rate swap |  |
Financial assets: |  |
Derivative financial instruments | $ 4,793,000 | $ 1,615,000
Financial liabilities: |  |
Derivative financial instruments |  | 1,492,000
Facility |  |
Fair Value of Financial Instruments |  |
Line of credit, gross | 0 | 9,400,000
Mortgages payable |  |
Fair Value of Financial Instruments |  |
Estimated fair value of mortgages payable | 392,836,000 | 397,103,000
Carrying value of mortgage loans | 407,007,000 | 396,946,000
Excess of carrying value over fair value | $ 14,171,000 |
Excess of fair value over carrying value |  | $ 157,000
Weighted average remaining term of the mortgages | 8 years 6 months | 8 years 8 months 12 days
Blended market interest rate | Mortgages payable |  |
Fair Value of Financial Instruments |  |
Mortgages payable | 4.90% | 4.25%

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- Definition Represents the amount of difference between the fair value and carrying value. + References No definition available. + Details
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- Definition Represents the weighted average remaining term of the mortgages based on which the market interest rate is assumed. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit before netting of deferred finance costs, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) post balance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancellable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations before netting of deferred finance costs (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References No definition available. + Details
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