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, 2016	Sep. 30, 2015	Dec. 31, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 26,204	$ 21,641
Provision for warranty expense	15,494	12,706
Warranty liability from acquired businesses	125	240
Warranty costs paid	(10,833)	(9,278)
Balance at end of period	30,990	25,309
Less long-term portion	11,383	8,740
Current portion of accrued warranty	$ 19,607	$ 16,569	$ 17,020