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Consolidated 50% Owned Subsidiaries - Statement of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]      
Operating income $ 107,287 $ 94,892 $ 37,751
Net income 62,645 42,306 39,901
Variable Interest Entity, Primary Beneficiary | Myers      
Variable Interest Entity [Line Items]      
Revenues 167,393 200,674 205,615
Operating income 3,222 4,796 6,372
Net income $ 2,565 $ 2,382 $ 3,196