Investments (Schedule Of Carrying Amount And Maximum Loss Exposure Of Equity Investments) (Details) - LB Pipe & Coupling Products, LLC [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	$ 6,712	$ 6,863
LB Pipe JV equity method investment [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	5,659	5,746
Net investment in direct financing lease [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss	$ 1,053	$ 1,117