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Business Segments and Geographic Information (Details 1) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Pre-Tax Income Reconciliation of Segments |  |
Total operating income from segments | $ 59,167 | $ 52,672
Unallocated Amount: |  |
General and Administrative Expenses | (34,061) | (31,848)
Income before income taxes and equity in earnings of affiliates | 34,358 | 30,099
Operating Segments |  |
Pre-Tax Income Reconciliation of Segments |  |
Total operating income from segments | 93,228 | 84,520
Segment Reconciling Items |  |
Unallocated Amount: |  |
General and Administrative Expenses | (34,061) | (31,848)
Net Interest Expense | $ (24,809) | $ (22,573)

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