Annual report pursuant to Section 13 and 15(d)

Benefit Plans and Collective Bargaining Agreements (Narrative) (Details)

v3.6.0.2
Benefit Plans and Collective Bargaining Agreements (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
employees
individual
agreements
Dec. 31, 2015
USD ($)
Jan. 03, 2015
USD ($)
Jun. 27, 2014
USD ($)
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Employer contributions to union-sponsored defined contribution retirement plans $ 22 $ 38 $ 2,180  
Bristol, Tennessee and Mineral Ridge, Ohio Facilities [Member]        
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Number of collective bargaining agreements (agreements) | agreements 2      
Number of company's employees represented by collective bargaining agreement (employees) | employees 132      
Percentage of company's employees represented by collective bargaining agreement (percent) 32.00%      
United Steelworkers [Member] | Bristol, Tennessee and Mineral Ridge, Ohio Facilities [Member]        
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Number of individuals representing a collective bargaining agreement (individual) | individual 2      
Bristol Fab [Member]        
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Pension withdrawal liability from closure of Bristol Fab   $ 644   $ 1,900