Accrued Expenses And Other Current Liabilities (Schedule Of Reconciliation Of The Activity Related To Accrued Warranty) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 21,641	$ 17,325
Provision for warranty expense	12,706	9,329
Warranty liability from acquired businesses	240	688
Warranty costs paid	(9,278)	(6,441)
Balance at end of period	25,309	20,901
Less long-term portion	8,740	6,831
Current portion of accrued warranty	$ 16,569	$ 14,070	$ 14,516