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Business Realignment (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Total business realignment charges $ 222 $ 171
Cost of Goods Sold [Member]    
Restructuring Cost and Reserve [Line Items]    
Total business realignment charges   90
Selling, General and Administrative Expenses [Member]    
Restructuring Cost and Reserve [Line Items]    
Total business realignment charges 222 81
PST Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Total business realignment charges [1] 222 171
PST Segment [Member] | Cost of Goods Sold [Member]    
Restructuring Cost and Reserve [Line Items]    
Severance costs   90
PST Segment [Member] | Selling, General and Administrative Expenses [Member]    
Restructuring Cost and Reserve [Line Items]    
Severance costs $ 222 $ 81
[1] Severance costs for the three months ended March 31, 2018 related to SG&A were $222. Severance costs for the three months ended March 31, 2017 related to COGS and SG&A were $90 and $81, respectively.