Investments (Schedule Of Carrying Amount And Maximum Loss Exposure Of Equity Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
LB Pipe & Coupling Products, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	$ 6,531	$ 6,241
LB Pipe JV equity method investment [Member] | LB Pipe & Coupling Products, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	4,996	5,246
Loan receivable [Member] | LB Pipe & Coupling Products, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	575	0
Net investment in direct financing lease [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	$ 960	$ 995