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Income Taxes (Schedule Of Income (Loss) Before Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Line Items] |  |  |
Income before income tax expense and equity earnings of unconsolidated joint ventures and entities | $ 14,844 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 12,718 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 2,282 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income attributable to noncontrolling interests | 57 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (104)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 492 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Equity earnings and gain on sale of unconsolidated subsidiary | 1,015 us-gaap_IncomeLossFromEquityMethodInvestments | 1,369 us-gaap_IncomeLossFromEquityMethodInvestments | 1,621 us-gaap_IncomeLossFromEquityMethodInvestments
Gain on sale of discontinued operation |  |  | (320)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Income (loss) before income tax expense | 15,916 rdi_IncomeLossBeforeIncomeTaxes | 13,983 rdi_IncomeLossBeforeIncomeTaxes | 3,990 rdi_IncomeLossBeforeIncomeTaxes
United States [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Income before income tax expense and equity earnings of unconsolidated joint ventures and entities | 2,778 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = country_US | 8,745 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = country_US | 836 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = country_US
Net income attributable to noncontrolling interests | 200 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_IncomeTaxAuthorityAxis = country_US | 24 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_IncomeTaxAuthorityAxis = country_US | 578 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_IncomeTaxAuthorityAxis = country_US
Equity earnings and gain on sale of unconsolidated subsidiary |  | (1)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = country_US | 27 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = country_US
Foreign [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Income before income tax expense and equity earnings of unconsolidated joint ventures and entities | 12,066 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 3,973 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 1,446 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Net income attributable to noncontrolling interests | (143)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | (128)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | (86)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Equity earnings and gain on sale of unconsolidated subsidiary | 1,015 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 1,370 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 1,594 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Gain on sale of discontinued operation |  |  | $ (405)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember

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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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