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Consolidated 50% Owned Subsidiaries Consolidated 50% Owned Subsidiaries - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Variable Interest Entity [Line Items]
Operating income	$ 32,031	$ 28,831	$ 87,506	$ 73,980
Net income	21,126	15,157	51,737	36,482
Variable Interest Entity, Primary Beneficiary | Myers
Variable Interest Entity [Line Items]
Revenues	50,338	57,566	121,432	156,292
Operating income	808	1,889	2,273	3,093
Net income	$ 1,379	$ 932	$ 2,096	$ 1,537

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