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Assets (Details 4) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 04, 2014
Property, plant and equipment, net            
Gross property, plant, and equipment $ 178,184   $ 178,184   $ 170,542  
Less accumulated depreciation and amortization 97,663   97,663   91,790  
Net property, plant and equipment 80,521   80,521   78,752  
Depreciation 3,200 $ 2,900 8,900 $ 8,700    
Goodwill            
Impairment of goodwill     0      
Goodwill acquired     0      
Gross carrying Amount, beginning balance     238,158      
Accumulated Impairment, beginning balance     123,199      
Net Amount, beginning balance     114,959      
Purchase price adjustment     (51)      
Gross carrying Amount, ending balance 238,107   238,107      
Accumulated Impairment, ending balance 123,199   123,199      
Net Amount, ending balance 114,908   114,908      
Intangible assets            
Impairment of intangible assets     0      
Intangible assets acquired     0      
Accumulated Amortization and Impairment 144,638   144,638   123,205  
Total Gross Intangible Assets 282,114   282,114   282,513  
Total Net Intangible Assets 137,476   137,476   159,308  
Indefinite-lived trademark            
Intangible assets            
Indefinite-lived intangible assets 2,900   2,900   2,900  
Technology            
Intangible assets            
Gross Carrying Amount 222,358   222,358   222,358  
Accumulated Amortization and Impairment 116,958   116,958   106,342  
Net Amount 105,400   105,400   116,016  
Customer relationships            
Intangible assets            
Gross Carrying Amount 47,885   47,885   47,885  
Accumulated Amortization and Impairment 20,578   20,578   14,918  
Net Amount 27,307   27,307   32,967  
Trademarks and tradenames            
Intangible assets            
Gross Carrying Amount 2,730   2,730   3,050  
Accumulated Amortization and Impairment 1,719   1,719   1,096  
Net Amount 1,011   1,011   1,954  
Other            
Intangible assets            
Gross Carrying Amount 6,241   6,241   6,320  
Accumulated Amortization and Impairment 5,383   5,383   849  
Net Amount 858   858   5,471  
Land            
Property, plant and equipment, net            
Gross property, plant, and equipment 9,592   9,592   9,392  
Building and improvements            
Property, plant and equipment, net            
Gross property, plant, and equipment 54,562   54,562   51,979  
Machinery and equipment            
Property, plant and equipment, net            
Gross property, plant, and equipment 108,613   108,613   104,815  
Leaseholds improvements            
Property, plant and equipment, net            
Gross property, plant, and equipment $ 5,417   $ 5,417   $ 4,356  
PSP            
Goodwill            
Net assets acquired           $ 145,500