Joint Ventures (Summarized Information for Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$ 9,708	$ 12,751	$ 20,613	$ 24,160
Gross profit	1,865	3,921	4,927	7,214
Net income	$ 784	$ 2,124	$ 2,622	$ 4,078