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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Net Sales:
Total net sales	$ 162,099	$ 169,833	$ 323,430	$ 328,695
Long-term Assets:
Total long-term assets	198,914		198,914		218,720
North America [Member]
Net Sales:
Total net sales	79,718	76,789	159,516	151,592
Long-term Assets:
Total long-term assets	50,494		50,494		49,853
South America [Member]
Net Sales:
Total net sales	32,920	46,715	66,836	89,144
Long-term Assets:
Total long-term assets	131,260		131,260		154,226
Europe and Other [Member]
Net Sales:
Total net sales	49,461	46,329	97,078	87,959
Long-term Assets:
Total long-term assets	$ 17,160		$ 17,160		$ 14,641