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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating income	$ 65,936	$ 44,507	$ 34,752
Other general and administrative expenses	87,508	80,044	61,421
Depreciation and amortization	14,494	12,051	10,574
Interest income	(268)	(624)	(1,523)
Interest expense	5,806	3,189	3,105
Income from continuing operations before income taxes	60,398	41,942	33,170
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	$ 167,938	$ 136,602	$ 106,747

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