Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Goodwill and other intangibles	$ 32,699	$ 1,354
Pension and post-retirement liability	2,186	1,801
Warranty reserve	3,633	3,153
Deferred compensation	1,227	2,275
Accounts receivable	516	622
Contingent liabilities	2,336	2,087
Long-term insurance reserves	567	655
Net operating loss / tax credit carryforwards	1,384	1,006
Other	1,107	949
Total deferred tax assets	45,655	13,902
Less: valuation allowance	(29,719)
Net deferred tax assets	15,936	13,902
Goodwill and other intangibles	(6,087)	(7,155)
Depreciation	(10,586)	(14,134)
Unremitted earnings of foreign subsidiary	(7,932)
Inventories	(1,506)
Investment in LB Pipe joint venture	(756)	(572)
Other	(440)	(741)
Total deferred tax liabilities	(27,307)	(22,602)
Net deferred tax liability	$ (11,371)	$ (8,700)