Joint Ventures (Summarized Information for Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$ 16,431	$ 20,004	$ 38,924	$ 48,383
Gross profit (loss)	4,989	5,973	10,189	13,517
Net income (loss)	$ 3,508	$ 3,546	$ 6,090	$ 7,470