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Business Segments and Geographic Information - Income Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pre-Tax Income Reconciliation of Segments |  |  |  |
Total operating income from segments | $ 66,951 | $ 54,553 | $ 131,401 | $ 118,925
Unallocated Amount: |  |  |  |
General and Administrative Expenses | (47,448) | (52,206) | (89,280) | (94,792)
Income before income taxes and equity in earnings of affiliates | 38,699 | 30,916 | 76,379 | 72,265
Operating Segments |  |  |  |
Pre-Tax Income Reconciliation of Segments |  |  |  |
Total operating income from segments | 114,399 | 106,759 | 220,681 | 213,717
Segment Reconciling Items |  |  |  |
Unallocated Amount: |  |  |  |
General and Administrative Expenses | (47,448) | (52,206) | (89,280) | (94,792)
Net Interest Expense | $ (28,252) | $ (23,637) | $ (55,022) | $ (46,660)

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