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Unconsolidated Subsidiaries (Schedule) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Variable Interest Entity [Line Items]        
Revenues $ 41,352 $ 33,681 $ 81,449 $ 64,881
Gross profit 8,668 4,846 22,053 10,270
Variable interest entity, not primary beneficiary        
Variable Interest Entity [Line Items]        
Revenues 177,883 182,018 365,122 365,064
Gross profit 14,631 20,405 33,767 41,468
Income before income taxes $ 14,516 $ 15,456 $ 31,253 $ 31,578