Segment Reporting (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Net Sales:
Total net sales	$ 170,338	$ 161,556	$ 493,768	$ 490,251
Long-term Assets:
Total long-term assets	189,894		189,894		218,720
North America [Member]
Net Sales:
Total net sales	86,744	76,251	246,260	227,843
Long-term Assets:
Total long-term assets	52,950		52,950		49,853
South America [Member]
Net Sales:
Total net sales	37,029	43,626	103,865	132,770
Long-term Assets:
Total long-term assets	121,380		121,380		154,226
Europe and Other [Member]
Net Sales:
Total net sales	46,565	41,679	143,643	129,638
Long-term Assets:
Total long-term assets	$ 15,564		$ 15,564		$ 14,641