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, 2017	Mar. 31, 2016	Dec. 31, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 32,393	$ 26,204
Provision for warranty expense	5,306	5,477
Warranty liability from acquired businesses	0	125
Warranty costs paid	(4,590)	(3,692)
Balance at end of period	33,109	28,114
Less long-term portion	12,712	9,929
Current portion of accrued warranty	$ 20,397	$ 18,185	$ 20,393