Unconsolidated Subsidiaries (Schedule) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Variable Interest Entity [Line Items]
Revenues	$ 178,007	$ 196,500	$ 351,428	$ 390,234
Gross profit	40,529	35,381	80,534	73,570
Net income (loss)	3,116	(275)	5,918	752
Variable interest entity, not primary beneficiary
Variable Interest Entity [Line Items]
Revenues	160,281	155,103	305,351	303,174
Gross profit	19,673	18,068	38,421	36,946
Income before income taxes	13,246	12,531	26,367	25,650
Net income (loss)	$ 9,717	$ 9,563	$ 19,727	$ 19,718