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, 2015	Mar. 31, 2014	Dec. 31, 2014
Net Sales:
Total net sales	$ 162,825us-gaap_Revenues	$ 161,331us-gaap_Revenues
Long-term Assets:
Total long-term assets	140,953us-gaap_AssetsNoncurrent		153,240us-gaap_AssetsNoncurrent
North America [Member]
Net Sales:
Total net sales	89,753	79,798
Long-term Assets:
Total long-term assets	56,370		53,406
South America [Member]
Net Sales:
Total net sales	26,523	33,916
Long-term Assets:
Total long-term assets	70,708		85,433
Europe and Other [Member]
Net Sales:
Total net sales	46,549	47,617
Long-term Assets:
Total long-term assets	$ 13,875		$ 14,401