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Mortgages Payable (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) loan item | Sep. 30, 2016 USD ($) item | Sep. 30, 2015 USD ($) item | Dec. 31, 2015 USD ($) item
Debt instrument |  |  |  |
Number of assumed mortgages refinanced | loan | 1 |  |  |
Assumed mortgages payable |  | $ 32,500,000 | $ 0 |
Proceeds from mortgages payable | $ 10,000,000 | 9,963,000 |  |
Mortgage Payable Balance | 503,201,000 | 503,201,000 |  | $ 646,187,000
Maturity mortgages payable, excluding net premiums |  |  |  |
2017 | 175,000,000 | 175,000,000 |  |
2018 | 350,000,000 | 350,000,000 |  |
2019 | 550,000,000 | 550,000,000 |  |
Thereafter | 2,300,000,000 | 2,300,000,000 |  |
Totals | $ 3,375,000,000 | $ 3,375,000,000 |  |
Minimum |  |  |  |
Debt instrument |  |  |  |
Weighted Average Stated Interest Rate (as a percent) | 2.30% | 2.30% |  | 2.00%
Weighted Average Effective Interest Rate (as a percent) | 2.50% | 2.50% |  | 2.20%
Maximum |  |  |  |
Debt instrument |  |  |  |
Weighted Average Stated Interest Rate (as a percent) | 6.90% | 6.90% |  | 6.90%
Weighted Average Effective Interest Rate (as a percent) | 8.80% | 8.80% |  | 8.90%
Mortgages Payable |  |  |  |
Debt instrument |  |  |  |
Amount repaid |  | $ 183,700,000 | 140,800,000 |
Net premiums recorded upon acquisition of mortgages |  | 692,000 |  |
Remaining balance of deferred financing costs at period end | $ 374,000 | $ 374,000 |  | $ 553,000
Number of Properties | item | 129 | 129 |  | 183
Weighted Average Stated Interest Rate (as a percent) | 4.90% | 4.90% |  | 4.90%
Weighted Average Effective Interest Rate (as a percent) | 4.30% | 4.30% |  | 4.10%
Weighted Average Remaining Years Until Maturity |  | 3 years 10 months 24 days |  | 3 years 7 months 6 days
Principal Balance | $ 496,470,000 | $ 496,470,000 |  | $ 637,658,000
Unamortized Premium Balance | 6,731,000 | 6,731,000 |  | 8,529,000
Mortgage Payable Balance | $ 503,201,000 | $ 503,201,000 |  | $ 646,187,000
Number of mortgages | item | 38 | 38 |  | 44
Number of properties with mortgages | item | 129 | 129 |  | 183
Maturity mortgages payable, excluding net premiums |  |  |  |
2016 | $ 36,300,000 | $ 36,300,000 |  |
2017 | 109,400,000 | 109,400,000 |  |
2018 | 15,900,000 | 15,900,000 |  |
2019 | 42,300,000 | 42,300,000 |  |
2020 | 82,400,000 | 82,400,000 |  |
Thereafter | 210,200,000 | 210,200,000 |  |
Totals | 496,500,000 | 496,500,000 |  |
Mortgages repaid in full |  |  |  |
Debt instrument |  |  |  |
Amount repaid |  | $ 161,500,000 | $ 135,300,000 |
Maturity mortgages payable, excluding net premiums |  |  |  |
Number of mortgages repaid | item |  | 8 | 10 |
Variable rate mortgages |  |  |  |
Debt instrument |  |  |  |
Principal Balance | $ 68,100,000 | $ 68,100,000 |  | $ 51,100,000
Number of mortgages | item | 5 | 5 |  | 4
Number of properties with mortgages | item | 14 | 14 |  | 13
Variable rate mortgages after interest rate arrangements |  |  |  |
Debt instrument |  |  |  |
Principal Balance | $ 32,400,000 | $ 32,400,000 |  | $ 15,500,000
Number of mortgages | item | 3 | 3 |  | 2

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- Definition The increase in amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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