Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Percentage of Weighted Average Cost Inventory		43.00%	44.00%
Impairment of Long-Lived Assets Held-for-use		$ 0	$ 0	$ 0
Goodwill, Impairment Loss	$ 80,337	80,337	0	0
Goodwill, Impairment Loss, Net of Tax	$ 63,887	63,887
Indefinite-Lived Intangible Assets (Excluding Goodwill)		0
Product warranty reserves		8,755	11,500
Foreign currency transaction gains		1,616	422	433
Research and Development Expense		3,937	3,096	$ 3,154
Deferred Tax Assets, Gross, Noncurrent		226	93
Deferred Income Tax Liabilities		8,926	7,618
Accounting Standards Update 2015-17 [Member]
Deferred Tax Assets, Gross, Noncurrent			3,497
Deferred Income Tax Liabilities			77
Non-Domestic [Member]
Certificates of Deposit, at Carrying Value		1,939	25
Cash, Cash Equivalents, and Short-term Investments		$ 29,700	$ 49,233
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		13 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life		5 years
Minimum [Member] | Building [Member]
Property, Plant and Equipment, Useful Life		5 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life		2 years
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life		3 years
Weighted Average [Member]
Finite-Lived Intangible Asset, Useful Life		14 years