Unconsolidated Subsidiaries (Schedule) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Variable Interest Entity [Line Items]
Revenues	$ 168,582	$ 173,421
Gross profit	39,135	40,005
Net income	4,978	2,802
Variable interest entity, not primary beneficiary
Variable Interest Entity [Line Items]
Revenues	194,174	145,070
Gross profit	21,997	18,748
Income before income taxes	15,710	13,121
Net income	$ 11,681	$ 10,010