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Other Expense (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Other Expense [Line Items]        
Restructuring charges     $ 3,960,000  
Costs associated with patent dispute, and other matters 39,000 1,475,000 3,233,000 2,211,000
Costs associated with shareholder activism 2,441,000 0 3,966,000 0
Costs associated with purchase of a business 334,000 0 444,000 0
Other expense 14,484,000 4,608,000 20,520,000 8,514,000
Patent Infringement [Member]
        
Other Expense [Line Items]        
Costs associated with patent dispute, and other matters 0 1,500,000 1,900,000 2,200,000
Settlement costs     900,000  
Legal Fees [Member]
        
Other Expense [Line Items]        
Costs associated with patent dispute, and other matters 0   1,300,000  
Administrative Consolidation Costs [Member]
        
Other Expense [Line Items]        
Restructuring charges 648,000 3,133,000 1,855,000 6,303,000
Management Restructuring Costs [Member]
        
Other Expense [Line Items]        
Restructuring charges $ 11,022,000 $ 0 $ 11,022,000 $ 0