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Operating Segments and Geographic Information (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |
Cumulative effect adjustment | $ 1,020,755 | $ 933,900 | $ 848,324 |  |
Retained Earnings |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cumulative effect adjustment | $ 873,692 | $ 823,702 | $ 776,403 |  | $ 684,540
Cumulative-effect adjustment | Retained Earnings |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  | $ 4,200 |

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