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DEBT OBLIGATIONS (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2013
DEBT OBLIGATIONS |  |
Aggregate carrying value of real estate investments | $ 581,425,000 us-gaap_RealEstateInvestmentPropertyAtCost | 567,358,000 us-gaap_RealEstateInvestmentPropertyAtCost
Accumulated depreciation | 76,575,000 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation | 71,171,000 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Repayment of the outstanding debt |  |
2015 | 21,968,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |
2016 | 32,986,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |
2017 | 29,868,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |
2018 | 19,760,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |
2019 | 15,623,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |
Thereafter | 171,844,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |
Total | 292,049,000 us-gaap_SecuredDebt | 278,045,000 us-gaap_SecuredDebt
Mortgages payable |  |
DEBT OBLIGATIONS |  |
Number of debt instruments outstanding | 59 olp_DebtInstrumentOutstandingNumber / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Aggregate carrying value of real estate investments | 472,312,000 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Accumulated depreciation | $ 61,592,000 us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Weighted average interest rate (as a percent) | 5.02%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 5.22%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Mortgages payable | Minimum | Interest rate swap |  |
DEBT OBLIGATIONS |  |
Fixed interest rate (as a percent) | 3.13%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Mortgages payable | Maximum | Interest rate swap |  |
DEBT OBLIGATIONS |  |
Fixed interest rate (as a percent) | 7.81%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (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 Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: 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 + Details
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