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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ 17,048 | $ 9,607 | $ 29,218 | $ 20,268
Other general and administrative expenses | 22,176 | 20,667 | 42,891 | 39,873
Depreciation and amortization | 3,587 | 2,940 | 7,188 | 5,827
Interest income | (31) | (155) | (53) | (489)
Interest expense | 1,262 | 721 | 2,478 | 1,629
Income before income taxes | 15,817 | 9,041 | 26,793 | 19,128
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ 42,811 | $ 33,214 | $ 79,297 | $ 65,968

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