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Investments (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2018
USD ($)
Sep. 30, 2018
USD ($)
a
facility
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
a
facility
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments              
Equity investments   $ 155   $ 155   $ 162  
Assets held for sale     $ 3,875   $ 3,875    
Proceeds from sale of equity method investments       3,875 0    
Repayment of revolving line of credit from equity method investment       1,235 0    
Equity in income (loss) of nonconsolidated investments   (4) 50 (7) (5)    
Reclassified              
Schedule of Equity Method Investments              
Equity investments     $ (4,288)   $ (4,288)    
LB Pipe & Coupling Products, LLC              
Schedule of Equity Method Investments              
Equity method investment, ownership percentage 45.00%   45.00%   45.00%    
Other than temporary impairment of equity method investment           413  
Proceeds from sale of equity method investments $ 3,875            
Repayment of revolving line of credit from equity method investment 1,235            
Equity in income (loss) of nonconsolidated investments   $ 0 $ 434 $ 0 $ 386    
Interest income $ 159            
Line of credit, maximum lending capacity             $ 1,350
Due from joint ventures, current             $ 1,235
LB Pipe & Coupling Products, LLC | Capital leased land              
Schedule of Equity Method Investments              
Area of land (in acres) | a   5   5      
Capital leased assets, number of units | facility   2   2      
Capital leases, monthly rent       $ 17      
Capital leases balloon payment in direct financing leases   $ 488   488      
LB Pipe & Coupling Products, LLC | Other Joint Venture              
Schedule of Equity Method Investments              
Equity method investment, ownership percentage             45.00%
LB Pipe & Coupling Products, LLC | Third Party              
Schedule of Equity Method Investments              
Equity method investment, ownership percentage     45.00%   45.00%    
Other equity investments              
Schedule of Equity Method Investments              
Equity investments   $ 155   $ 155   $ 162