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Investments (Narrative) (Details)
$ in Thousands
12 Months Ended
Aug. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
a
facility
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments      
Proceeds from sale of equity method investments   $ 3,875 $ 0
Repayment of revolving line of credit from equity method investment   $ 1,235 $ 0
LB Pipe & Coupling Products, LLC      
Schedule of Equity Method Investments      
Equity method investment, ownership percentage 45.00%   45.00%
Equity investments     $ 3,875
Proceeds from sale of equity method investments $ 3,875    
Other than temporary impairment of equity method investment     413
Repayment of revolving line of credit from equity method investment 1,235    
Interest income $ 159    
Equity in income (loss) of nonconsolidated investments     386
LB Pipe & Coupling Products, LLC | Capital leased land      
Schedule of Equity Method Investments      
Area of land (in acres) | a   5  
Capital leased assets, number of units | facility   2  
Capital leases, monthly rent   $ 17  
Capital leases balloon payment in direct financing leases   488  
LB Pipe & Coupling Products, LLC | Carrying value      
Schedule of Equity Method Investments      
Equity investments     $ 4,288
LB Pipe & Coupling Products, LLC | Third Party      
Schedule of Equity Method Investments      
Equity method investment, ownership percentage     45.00%
Other equity investments      
Schedule of Equity Method Investments      
Equity investments   $ 155 $ 162