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Selected Quarterly Financial Data (Unaudited) (Narrative) (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
Quarterly Financial Information [Line Items]
Restructuring charges									$ 7,434,000us-gaap_RestructuringCharges
Costs associated with patent dispute and other matters	100,000us-gaap_LegalFees		1,400,000us-gaap_LegalFees						3,374,000us-gaap_LegalFees		1,555,000us-gaap_LegalFees
State income taxes, net of federal tax benefit									1.70%	1.80%	1.50%
Deferred income taxes									(284,000)us-gaap_DeferredIncomeTaxExpenseBenefit	7,218,000us-gaap_DeferredIncomeTaxExpenseBenefit	12,946,000us-gaap_DeferredIncomeTaxExpenseBenefit
Costs associated with shareholder activism		2,400,000us-gaap_ProfessionalFees	900,000us-gaap_ProfessionalFees	600,000us-gaap_ProfessionalFees					3,966,000us-gaap_ProfessionalFees	0us-gaap_ProfessionalFees	0us-gaap_ProfessionalFees
Loss on early extinguishment of debt								300,000	0	263,000	0
Settlement expense					1,400,000				0	1,443,000	0
Executive Restructuring [Member]
Quarterly Financial Information [Line Items]
Restructuring charges									12,546,000	0	0
Cost of Sales [Member]
Quarterly Financial Information [Line Items]
Restructuring charges									5,612,000	8,626,000	7,052,000
Cost of Sales [Member] \| Facility Consolidation Costs [Member]
Quarterly Financial Information [Line Items]
Restructuring charges	1,900,000	1,400,000	1,400,000	900,000	2,100,000	1,100,000	1,600,000	1,600,000	5,612,000	6,489,000	7,052,000
Cost of Sales [Member] \| Termination of a product offering [Member]
Quarterly Financial Information [Line Items]
Restructuring charges						2,100,000			0	2,137,000	0
Other Expense [Member]
Quarterly Financial Information [Line Items]
Restructuring charges									15,900,000	8,750,000	6,497,000
Other Expense [Member] \| Administrative consolidation costs [Member]
Quarterly Financial Information [Line Items]
Restructuring charges	1,500,000	600,000	500,000	700,000	2,400,000	3,100,000	1,600,000	1,600,000	3,354,000	8,750,000	6,497,000
Other Expense [Member] \| Executive Restructuring [Member]
Quarterly Financial Information [Line Items]
Restructuring charges	1,500,000	11,000,000							12,546,000	0	0
Distributor [Member]
Quarterly Financial Information [Line Items]
Costs associated with purchase									0	0	704,000
Business [Member]
Quarterly Financial Information [Line Items]
Costs associated with purchase	300,000	300,000							722,000	0	1,194,000
Patent Infringement [Member]
Quarterly Financial Information [Line Items]
Costs associated with patent dispute and other matters				1,900,000	1,000,000	1,500,000	500,000	200,000	1,900,000	3,206,000
Litigation Settlement, Expense				900,000					900,000
Legal Fees [Member]
Quarterly Financial Information [Line Items]
Costs associated with patent dispute and other matters									1,500,000
NEW YORK
Quarterly Financial Information [Line Items]
State income taxes, net of federal tax benefit				0.00%					0.00%
Deferred income taxes				$ 2,300,000					$ 2,300,000