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Unconsolidated Subsidiaries (Schedule) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Variable Interest Entity [Line Items]    
Revenues $ 37,644 $ 40,097
Gross profit 5,081 13,385
Variable interest entity, not primary beneficiary    
Variable Interest Entity [Line Items]    
Revenues 183,077 187,239
Gross profit 16,570 19,136
Income before income taxes $ 16,241 $ 16,737