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Segment Reporting (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Sales:
Total net sales	$ 660,579us-gaap_Revenues	$ 659,486us-gaap_Revenues	$ 612,466us-gaap_Revenues
Long-term Assets:
Total long-term assets	153,240us-gaap_AssetsNoncurrent	218,720us-gaap_AssetsNoncurrent
North America [Member]
Net Sales:
Total net sales	330,516	301,592	277,850
Long-term Assets:
Total long-term assets	53,406	49,853
South America [Member]
Net Sales:
Total net sales	139,780	178,532	180,410
Long-term Assets:
Total long-term assets	85,433	154,226
Europe and Other [Member]
Net Sales:
Total net sales	190,283	179,362	154,206
Long-term Assets:
Total long-term assets	$ 14,401	$ 14,641