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Business Segments and Geographic Information - Income Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Pre-Tax Income Reconciliation of Segments |  |
Total operating income from segments | $ 64,450 | $ 64,372
Unallocated Amount: |  |
General and Administrative Expenses | (41,832) | (42,586)
Income before income taxes and equity in earnings of affiliates | 37,680 | 41,349
Operating Segments |  |
Pre-Tax Income Reconciliation of Segments |  |
Total operating income from segments | 106,282 | 106,958
Segment Reconciling Items |  |
Unallocated Amount: |  |
General and Administrative Expenses | (41,832) | (42,586)
Net Interest Expense | $ (26,770) | $ (23,023)

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