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Commitments and Contingencies Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments And Contingencies Disclosure [Line Items]      
Accrual for Environmental Loss Contingencies $ 1,200    
Total rental expense 2,000 $ 1,800 $ 2,200
Total future minimum operating lease payments 14,084    
Operating Leases, Future Minimum Payments Receivable 700    
Property, plant and equipment, gross 83,364 82,532  
Accumulated depreciation and amortization $ 47,877 40,944  
EnvironmentalMonitoringPeriod 10 years    
Environmental Remediation Expense $ 931 340 $ 0
Total future minimum lease payments of McCook facility 8,859    
Proposed income tax adjustment 800 1,300  
Headquarters      
Commitments And Contingencies Disclosure [Line Items]      
Total future minimum operating lease payments 8,500    
McCook facility      
Commitments And Contingencies Disclosure [Line Items]      
Property, plant and equipment, gross 12,961 12,961  
Accumulated depreciation and amortization   4,600  
Capital leases      
Commitments And Contingencies Disclosure [Line Items]      
Property, plant and equipment, gross 563 302  
Accumulated depreciation and amortization   $ 300  
Capitalizable [Domain]      
Commitments And Contingencies Disclosure [Line Items]      
Environmental Exit Costs, Anticipated Cost 300    
Minimum      
Commitments And Contingencies Disclosure [Line Items]      
Environmental Exit Costs, Anticipated Cost 300    
Maximum      
Commitments And Contingencies Disclosure [Line Items]      
Environmental Exit Costs, Anticipated Cost $ 1,400