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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Operating income from continuing operations | $ 12,523 | $ 7,335 | $ 32,791 | $ 20,222
Other general and administrative expenses | 19,067 | 17,680 | 58,939 | 46,907
Depreciation and amortization | 3,045 | 2,756 | 8,872 | 7,365
Interest income | (87) | (786) | (576) | (1,096)
Interest expense | 680 | 866 | 2,309 | 2,164
Income from continuing operations before income taxes | 11,930 | 7,255 | 31,058 | 19,154
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income from continuing operations | $ 34,635 | $ 27,771 | $ 100,602 | $ 74,494

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