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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Operating income | $ 12,170 | $ 10,661
Other general and administrative expenses | 20,715 | 19,205
Depreciation and amortization | 3,601 | 2,887
Interest income | (22) | (334)
Interest expense | 1,216 | 908
Income before income taxes | 10,976 | 10,087
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating income | $ 36,486 | $ 32,753

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