Joint Ventures (Summarized Information for Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$ 11,210	$ 9,708	$ 20,386	$ 20,613
Gross profit	3,435	1,865	6,597	4,927
Net income	$ 1,416	$ 784	$ 2,642	$ 2,622