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Segments and Geographical Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Net revenues | $ 550,963 | $ 548,971
Gross profit | 394,356 | 402,096
Income from operations | 69,918 | 87,701
Interest income | 1,986 | 2,633
Impairments and other charges | 0 | 29,782
Depreciation and amortization | 20,738 | 18,316
Other income (expense), net | (18,549) | (5,746)
Net income before provision for income taxes and equity in losses of investee | 53,355 | 84,588
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Income from operations | 180,777 | 186,900
Clear Aligner |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 481,611 | 469,205
Gross profit | 351,492 | 351,358
Income from operations | 166,388 | 158,641
Impairments and other charges | 0 | 29,782
Depreciation and amortization | 10,121 | 9,090
Scanner |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 69,352 | 79,766
Gross profit | 42,864 | 50,738
Income from operations | 14,389 | 28,259
Depreciation and amortization | 1,785 | 1,508
Corporate, Non-Segment |  |
Segment Reporting Information [Line Items] |  |
Income from operations | (110,859) | (99,199)
Unallocated corporate expenses |  |
Segment Reporting Information [Line Items] |  |
Income from operations | (110,859) | (99,199)
Depreciation and amortization | $ 8,832 | $ 7,718

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