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Business Segments and Geographic Information (Asset Reconciliation) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Asset Reconciliation of Segments |  |  |
Cash | $ 32,463 | $ 31,255 | $ 81,377
Deferred income tax assets | 110,068 | 87,763 |
Total segment assets | 4,317,534 | 4,258,118 |
Operating Segments |  |  |
Asset Reconciliation of Segments |  |  |
Total segment assets | 4,185,452 | 4,122,830 | $ 4,046,323
Segment Reconciling Items |  |  |
Asset Reconciliation of Segments |  |  |
Cash | 32,463 | 31,255 |
Deferred income tax assets | 36,278 | 29,924 |
Restricted cash and investments, current and non-current | $ 63,341 | $ 74,109 |

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