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Assets (Details 4) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Property, plant and equipment, net      
Gross property, plant, and equipment $ 183,813   $ 179,843
Less accumulated depreciation and amortization 103,588   100,253
Net property, plant and equipment 80,225   79,590
Depreciation 3,300 $ 2,800  
Goodwill      
Impairment of goodwill 0    
Goodwill acquired 0    
Intangible assets      
Impairment of intangible assets 0    
Accumulated Amortization and Impairment 151,516   150,440
Total Gross Intangible Assets 278,169   282,114
Total Net Intangible Assets 126,653   131,674
Indefinite-lived trademark      
Intangible assets      
Indefinite-lived intangible assets 2,900   2,900
Technology      
Intangible assets      
Gross Carrying Amount 222,358   222,358
Accumulated Amortization and Impairment 124,021   120,496
Net Amount 98,337   101,862
Customer relationships      
Intangible assets      
Gross Carrying Amount 47,885   47,885
Accumulated Amortization and Impairment 24,017   22,470
Net Amount 23,868   25,415
Trademarks and tradenames      
Intangible assets      
Gross Carrying Amount 2,730   2,730
Accumulated Amortization and Impairment 1,975   1,937
Net Amount 755   793
Other      
Intangible assets      
Gross Carrying Amount 2,296   6,241
Accumulated Amortization and Impairment 1,503   5,537
Net Amount 793   704
Land      
Property, plant and equipment, net      
Gross property, plant, and equipment 9,592   9,592
Building and improvements      
Property, plant and equipment, net      
Gross property, plant, and equipment 57,264   54,622
Machinery and equipment      
Property, plant and equipment, net      
Gross property, plant, and equipment 111,392   110,075
Leaseholds improvements      
Property, plant and equipment, net      
Gross property, plant, and equipment $ 5,565   $ 5,554