Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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Segment Reporting, Geographic Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales [Abstract]
Total	$ 172,812,000us-gaap_SalesRevenueGoodsNet	$ 184,007,000us-gaap_SalesRevenueGoodsNet	$ 181,575,000us-gaap_SalesRevenueGoodsNet	$ 166,784,000us-gaap_SalesRevenueGoodsNet	$ 144,691,000us-gaap_SalesRevenueGoodsNet	$ 155,264,000us-gaap_SalesRevenueGoodsNet	$ 179,941,000us-gaap_SalesRevenueGoodsNet	$ 162,987,000us-gaap_SalesRevenueGoodsNet	$ 705,178,000us-gaap_SalesRevenueGoodsNet	$ 642,883,000us-gaap_SalesRevenueGoodsNet	$ 794,634,000us-gaap_SalesRevenueGoodsNet
Long-lived assets	448,542,000us-gaap_NoncurrentAssets				462,509,000us-gaap_NoncurrentAssets				448,542,000us-gaap_NoncurrentAssets	462,509,000us-gaap_NoncurrentAssets	515,102,000us-gaap_NoncurrentAssets
Domestic Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									583,011,000	532,534,000	678,347,000
Export Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									122,167,000	110,349,000	116,287,000
Eliminations [Member]
Net sales [Abstract]
Total									0	0	0
Long-lived assets	(370,379,000)				(339,712,000)				(370,379,000)	(339,712,000)	(339,712,000)
Eliminations [Member] \| Domestic Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									0	0	0
Eliminations [Member] \| Export Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									0	0	0
United States [Member]
Net sales [Abstract]
Total									688,833,000	622,717,000	770,459,000
Long-lived assets	775,973,000				759,793,000				775,973,000	759,793,000	816,599,000
United States [Member] \| Domestic Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									568,087,000	512,777,000	665,479,000
United States [Member] \| Export Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									120,746,000	109,940,000	114,980,000
Canada [Member]
Net sales [Abstract]
Total									57,000	77,000	14,000
Long-lived assets	32,065,000				31,291,000				32,065,000	31,291,000	26,880,000
Canada [Member] \| Domestic Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									57,000	77,000	14,000
Canada [Member] \| Export Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									0	0	0
Mexico [Member]
Net sales [Abstract]
Total									16,288,000	20,089,000	24,161,000
Long-lived assets	10,883,000				11,137,000				10,883,000	11,137,000	11,335,000
Mexico [Member] \| Domestic Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									14,867,000	19,680,000	22,854,000
Mexico [Member] \| Export Sales [Member]
Net sales [Abstract]
Sales to unaffiliated customers									$ 1,421,000	$ 409,000	$ 1,307,000