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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Operating income $ 16,894 $ 17,048 $ 30,407 $ 29,218
Other general and administrative expenses 24,111 22,176 48,188 42,891
Depreciation and amortization 3,609 3,587 7,130 7,188
Interest income (108) (31) (166) (53)
Interest expense 1,986 1,262 3,806 2,478
Income before income taxes 15,016 15,817 26,767 26,793
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Operating income $ 44,614 $ 42,811 $ 85,725 $ 79,297