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Consolidated 50% Owned Subsidiaries - Statement of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]      
Operating income $ 94,892 $ 37,751 $ 42,611
Net income 42,306 39,901 25,187
Variable Interest Entity, Primary Beneficiary | Myers      
Variable Interest Entity [Line Items]      
Revenues 200,674 205,615 193,677
Operating income 4,796 6,372 8,819
Net income $ 2,382 $ 3,196 $ 4,415