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
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Net Sales:
Total net sales	$ 236,389	$ 235,710
Long-term Assets:
Total long-term assets	250,558		248,086
North America [Member]
Net Sales:
Total net sales	155,330	153,099
Long-term Assets:
Total long-term assets	76,289		79,219
South America [Member]
Net Sales:
Total net sales	33,916	42,429
Long-term Assets:
Total long-term assets	158,108		154,226
Europe and Other [Member]
Net Sales:
Total net sales	47,143	40,182
Long-term Assets:
Total long-term assets	$ 16,161		$ 14,641