Accrued Expenses And Other Current Liabilities (Schedule Of Reconciliation Of The Activity Related To Accrued Warranty) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Accrued Expenses And Other Current Liabilities [Abstract]
Balance at beginning of period	$ 8,640	$ 5,892
Provision for warranty expense	8,548	5,291
Warranty liability from acquired businesses	12	527
Warranty costs paid	(5,813)	(3,467)
Total accrued warranty	11,387	8,243
Less long-term portion	3,374	2,578
Current accrued warranty	$ 8,013	$ 5,665	$ 5,882