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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating income	$ 17,360	$ 12,523	$ 46,578	$ 32,791
Other general and administrative expenses	20,757	19,067	63,648	58,939
Depreciation and amortization	3,406	3,045	10,594	8,872
Interest income	(37)	(87)	(90)	(576)
Interest expense	1,614	680	4,092	2,309
Income before income taxes	15,783	11,930	42,576	31,058
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	$ 41,523	$ 34,635	$ 120,820	$ 100,602

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