Unconsolidated Subsidiaries Unconsolidated Subsidiaries (Schedule) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Variable Interest Entity [Line Items]
Revenues	$ 239,107	$ 221,714	$ 629,341	$ 599,497
Gross profit	42,215	46,543	115,785	119,237
Net income	3,141	7,699	3,893	2,551
Variable interest entity, not primary beneficiary
Variable Interest Entity [Line Items]
Revenues	154,545	150,529	457,719	437,127
Gross profit	18,112	19,504	55,057	56,123
Income before income taxes	12,571	12,201	38,221	36,363
Net income	$ 9,777	$ 9,372	$ 29,495	$ 28,046