Accrued Expenses And Other Current Liabilities (Schedule Of Reconciliation Of The Activity Related To Accrued Warranty) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 32,393	$ 26,204
Provision for warranty expense	11,833	10,472
Warranty liability from acquired businesses	150	125
Warranty costs paid	(9,079)	(7,038)
Balance at end of period	35,297	29,763
Less long-term portion	13,592	10,849
Current portion of accrued warranty	$ 21,705	$ 18,914	$ 20,393