Unconsolidated Subsidiaries (Schedule) (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]
Gross profit	$ 6,820	$ 6,187	$ 15,741	$ 28,240
Variable interest entity, not primary beneficiary
Variable Interest Entity [Line Items]
Gross profit	18,046	20,059	49,792	53,826
Income before income taxes	$ 15,629	$ 17,827	$ 45,673	$ 49,080