Accrued Expenses And Other Current Liabilities (Schedule of Reconciliation of the Activity Related to Accrued Warranty) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease)
Balance at beginning of period	$ 38,502	$ 32,393	$ 26,204
Provision for warranty expense	31,819	25,399	20,985
Warranty liability from acquired businesses	760	150	125
Warranty costs paid	(24,551)	(19,440)	(14,921)
Balance at end of period	46,530	38,502	32,393
Less long-term portion	14,350	15,447	12,000
Current portion of accrued warranty	$ 32,180	$ 23,055	$ 20,393