Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating income	$ 90,956	$ 68,737	$ 65,936
Other general and administrative expenses	104,312	96,417	87,508
Depreciation and amortization	14,126	14,060	14,494
Interest income	(1,476)	(341)	(268)
Interest expense	11,106	8,907	5,806
Income before income taxes	81,326	60,171	60,398
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	$ 209,394	$ 179,214	$ 167,938