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Unconsolidated Subsidiaries (Schedule) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Variable Interest Entity [Line Items]        
Gross profit $ 3,840 $ 8,668 $ 8,921 $ 22,053
Variable interest entity, not primary beneficiary        
Variable Interest Entity [Line Items]        
Gross profit 15,176 14,631 31,746 33,767
Income before income taxes $ 13,803 $ 14,516 $ 30,044 $ 31,253