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Fair Value Measurements (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Available-for-sale securities |  |
Aggregate cost of available-for-sale securities | $ 138,000 |
Unrealized gain on available-for-sale securities | 148,000 |
Recurring | Carrying and fair Value |  |
Available-for-sale securities: |  |
Equity securities | 286,000 | 278,000
Derivative financial instruments | 166,000 |
Financial liabilities: |  |
Derivative financial instruments | 1,416,000 | 1,470,000
Recurring | Level 1 |  |
Available-for-sale securities: |  |
Equity securities | 286,000 | 278,000
Recurring | Level 2 |  |
Available-for-sale securities: |  |
Derivative financial instruments | 166,000 |
Financial liabilities: |  |
Derivative financial instruments | 1,416,000 | 1,470,000
BRT Realty Trust |  |
Available-for-sale securities: |  |
Equity securities | 266,000 |
Other equity securities |  |
Available-for-sale securities: |  |
Equity securities | 20,000 |
Mortgages payable |  |
Fair Value of Financial Instruments |  |
Estimated fair value of mortgages payable | 279,852,000 | 233,170,000
Excess of fair value over carrying value | $ 3,047,000 | $ 7,199,000
Blended or estimated market interest rate (as a percent) | 5.00% | 4.80%
Weighted average remaining term of the mortgages | 9 years 3 months 18 days | 9 years 2 months 12 days

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