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Business Segments and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Pre-Tax Income Reconciliation of Segments |  |
Total operating income from segments | $ 84,520 geo_SegmentReportingInformationOperatingIncome | $ 77,072 geo_SegmentReportingInformationOperatingIncome
Unallocated Amount: |  |
General and Administrative Expenses | (31,848)us-gaap_GeneralAndAdministrativeExpense | (28,502)us-gaap_GeneralAndAdministrativeExpense
Net Interest Expense | (22,573)us-gaap_InterestIncomeExpenseNet | (19,920)us-gaap_InterestIncomeExpenseNet
Income before income taxes and equity in earnings of affiliates | $ 30,099 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 28,650 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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