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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Operating income | $ 65,936 | $ 44,507 | $ 34,752
Other general and administrative expenses | 87,508 | 80,044 | 61,421
Depreciation and amortization | 14,494 | 12,051 | 10,574
Interest income | (268) | (624) | (1,523)
Interest expense | 5,806 | 3,189 | 3,105
Income from continuing operations before income taxes | 60,398 | 41,942 | 33,170
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | $ 167,938 | $ 136,602 | $ 106,747

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