Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Percentage of Weighted Average Cost Inventory	38.00%	37.00%
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Accrual for Environmental Loss Contingencies	2,190	2,141
Asset Retirement Obligation	667	663
Product Warranty Accrual	7,483	15,727
Foreign Currency Transaction Gain (Loss), Realized	433	(238)	237
Research and Development Expense	3,154	2,926	1,899
Non-Domestic [Member]
Certificates of Deposit, at Carrying Value	32,947	26,045
Cash, Cash Equivalents, and Short-term Investments	$ 43,560	$ 38,731
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	25 years
Maximum [Member] | Building [Member]
Property, Plant and Equipment, Useful Life	40 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	10 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life	14 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Minimum [Member] | Building [Member]
Property, Plant and Equipment, Useful Life	25 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life	2 years
Weighted Average [Member]
Finite-Lived Intangible Asset, Useful Life	17 years