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SUBSEQUENT EVENTS (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 15, 2015 | Mar. 10, 2015
Subsequent event |  |  |  |  |
Quarterly cash dividend declared (in dollars per share) | $ 1.50 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.42 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.34 us-gaap_CommonStockDividendsPerShareCashPaid |  |
Quarterly cash dividend declared | $ 24,117 us-gaap_DividendsCommonStockCash | $ 21,999 us-gaap_DividendsCommonStockCash | $ 19,924 us-gaap_DividendsCommonStockCash |  |
Subsequent event |  |  |  |  |
Subsequent event |  |  |  |  |
Restricted share grants |  |  |  | 129,975 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Aggregate value of restricted shares granted |  |  |  | 3,197 olp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodValues / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent event | Forecast |  |  |  |  |
Subsequent event |  |  |  |  |
Quarterly cash dividend declared (in dollars per share) |  |  |  |  | $ 0.39 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Quarterly cash dividend declared |  |  |  |  | $ 6,382 us-gaap_DividendsCommonStockCash / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition The value of shares granted during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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