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Business Segments and Geographic Information (Pre-Tax Income Reconciliation of Segments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pre-Tax Income Reconciliation of Segments |  |  |
Total operating income from segments | $ 449,180 | $ 438,628 | $ 414,293
Unallocated amounts: |  |  |
General and administrative expense | (184,515) | (190,343) | (148,709)
Net interest expense | (115,348) | (96,348) | (100,222)
Loss on extinguishment of debt | 0 | 0 | (15,885)
Income Before Income Taxes and Equity in Earnings of Affiliates | 149,317 | 151,937 | 149,477
Operating Segments |  |  |
Pre-Tax Income Reconciliation of Segments |  |  |
Total operating income from segments | $ 449,180 | $ 438,628 | $ 414,293

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