Accrued Expenses And Other Current Liabilities (Schedule Of Reconciliation Of The Activity Related To Accrued Warranty) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 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	5,477	4,531
Warranty liability from acquired businesses	125	0
Warranty costs paid	(3,692)	(2,666)
Balance at end of period	28,114	23,506
Less long-term portion	9,929	8,222
Current portion of accrued warranty	$ 18,185	$ 15,284	$ 17,020