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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Variable Interest Entity [Line Items]        
Operating income $ 28,831 $ 12,115 $ 73,980 $ 28,019
Net income 15,157 7,957 36,482 17,600
Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Revenues 57,566 55,111 156,292 157,189
Operating income 1,889 1,861 3,093 4,142
Net income $ 1,864 $ 1,869 $ 3,073 $ 4,160