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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Operating income	$ 17,048	$ 9,607	$ 29,218	$ 20,268
Other general and administrative expenses	22,176	20,667	42,891	39,873
Depreciation and amortization	3,587	2,940	7,188	5,827
Interest income	(31)	(155)	(53)	(489)
Interest expense	1,262	721	2,478	1,629
Income before income taxes	15,817	9,041	26,793	19,128
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	$ 42,811	$ 33,214	$ 79,297	$ 65,968

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