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Restructuring (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Positions
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Reduction in positions from restructuring | Positions     25      
Accrued liabilities for restructuring charges $ 10,200   $ 10,200      
Restructuring reserve, noncurrent 2,000   2,000      
Restructuring expenses, net 6,648 $ 1,211 7,327 $ 10,212    
Scenario, Forecast [Member]            
Payments for restructuring         $ 20,000 $ 10,200
Machine Clothing [Member]            
Restructuring expenses, net 5,434 $ 1,211 $ 6,132 $ 10,212    
Machine Clothing [Member] | Relocation of Equipment From Germany [Member]            
Restructuring expenses, net $ 1,800