Valuation And Qualifying Accounts (Schedule Of Valuation And Qualifying Accounts) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Engineered Values [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Long-term accounts receivable allowances			$ 2,400
Allowance For Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 8,290	9,536	$ 2,449
Additions (Reductions) Charged to Costs and Expenses		613	2,561	7,817
Additions (Reductions) Charged to Other Accounts		425	(1,748)	(162)
Deductions	[1]	(4,272)	(2,059)	(568)
Balance at End of Period		$ 5,056	$ 8,290	$ 9,536

[1] Uncollectible accounts written off, net of recoveries.(2)Balance at end of period excludes the engineered valves accounts receivable allowances of $2.4 million, which are classified as long-term as of December 31, 2015.