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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 704,528 $ 684,613  
Accumulated depreciation and amortization of property, plant and equipment (371,173) (363,030)  
Property, plant and equipment, net 333,355 321,583  
Building impairment   4,718  
Proceeds from sale of building 5,154 1,563  
Gain on sale of building 1,377    
Fair value of building held-for-sale   4,000  
Property, plant and equipment retirements and disposals $ 29,000 10,000 $ 19,000
Gains on disposals of property, plant and equipment   1,000  
Property, plant and equipment disposition disclosures Gains on disposal were $1 million during the year ended December 31, 2014 and were immaterial for 2015 and 2013.   Gains on disposal were $1 million during the year ended December 31, 2014 and were immaterial for 2015 and 2013.
Land and land improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 38,735 39,688  
Buildings and leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 265,300 256,603  
Production and other equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 380,016 367,716  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 20,477 $ 20,606