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Fair Value Measurements - Derivative Instruments, Gain (Loss) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) item | Dec. 31, 2017 USD ($)
Reclassification of gain (loss) |  |  |  |  |
Amount of reclassification from Accumulated other comprehensive income to earnings |  |  | $ 110,000 |  |
Interest rate swap | Cash flow hedges |  |  |  |  |
Fair Value Measurements |  |  |  |  |
Amount of gain (loss) recognized on derivatives in Other comprehensive income | $ 827,000 | $ (248,000) | 4,336,000 | $ (1,234,000) |
Amount of reclassification from Accumulated other comprehensive income into Interest expense | (44,000) | (352,000) | (335,000) | (1,406,000) |
Reclassification of gain (loss) |  |  |  |  |
Amount of reclassification from Accumulated other comprehensive income to earnings |  |  | 110,000 | 118,000 |
Amount of effectiveness testing on cash flow hedges | 0 | 0 | 0 | $ 0 |
Additional amount to be reclassified during the next twelve months |  |  | $ 503,000 |  |
Number of interest rate swaps | item |  |  | 2 | 2 |
Credit risk related contingent feature |  |  |  |  |
Accrued interest on derivative in a liability position |  |  |  |  | $ 53,000
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for nonperformance risk |  |  |  |  | 1,638,000
Termination value of derivative agreement |  |  |  |  | 1,638,000
Derivatives in liability position | $ 0 |  | $ 0 |  |
Interest rate swap | Cash flow hedges | Accrued expenses and other liabilities |  |  |  |  |
Credit risk related contingent feature |  |  |  |  |
Adjustments for nonperformance risk |  |  |  |  | $ 93,000
Unconsolidated joint ventures | Interest rate swap | Cash flow hedges |  |  |  |  |
Fair Value Measurements |  |  |  |  |
Amount of gain (loss) recognized on derivatives in Other comprehensive income |  | (2,000) | 69,000 | $ (14,000) |
Amount of reclassification from Accumulated other comprehensive income into Equity in earnings of unconsolidated joint ventures |  | $ (13,000) | $ 103,000 | $ (48,000) |

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into equity in earnings of unconsolidated joint ventures on derivative instruments designated and qualifying as hedging instruments. + References No definition available. + Details
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- Definition The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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