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, 2020	Dec. 31, 2019	Dec. 31, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease)
Balance at beginning of period	$ 47,167	$ 46,530	$ 38,502
Provision for warranty expense	19,037	30,520	31,819
Warranty liability from acquired businesses	2,915	287	760
Warranty costs paid	(22,028)	(30,170)	(24,551)
Balance at end of period	47,091	47,167	46,530
Less long-term portion	14,640	17,269	14,350
Current portion of accrued warranty	$ 32,451	$ 29,898	$ 32,180