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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Operating income	$ 12,170	$ 10,661
Other general and administrative expenses	20,715	19,205
Depreciation and amortization	3,601	2,887
Interest income	(22)	(334)
Interest expense	1,216	908
Income before income taxes	10,976	10,087
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	$ 36,486	$ 32,753

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