Unconsolidated Subsidiaries Unconsolidated Subsidiaries (Schedule) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Variable Interest Entity [Line Items]
Revenues	$ 196,500	$ 200,370	$ 390,234	$ 377,783
Gross profit	35,381	36,523	73,570	72,694
Net income (loss)	(275)	(3,624)	752	(5,148)
Variable interest entity, not primary beneficiary
Variable Interest Entity [Line Items]
Revenues	155,103	148,075	303,174	286,598
Gross profit	18,068	17,126	36,946	36,619
Income before income taxes	12,531	10,994	25,650	24,162
Net income (loss)	$ 9,563	$ 8,530	$ 19,718	$ 18,674