Product Warranty (Reconciliation Of Product Warranties) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Product Warranty [Abstract]
Balance at beginning of period	$ 10,452	$ 10,256
Charged to costs and expenses	1,179	1,871
Claims settled	(1,889)	(2,290)
Other	91	145
Balance at end of period	$ 9,833	$ 9,982