Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Operating income	$ 13,513	$ 12,170
Other general and administrative expenses	24,077	20,715
Depreciation and amortization	3,521	3,601
Interest income	(58)	(22)
Interest expense	1,820	1,216
Income before income taxes	11,751	10,976
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	$ 41,111	$ 36,486