Accrued Expenses And Other Current Liabilities (Schedule Of Reconciliation Of The Activity Related To Accrued Warranty) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 47,091	$ 47,167
Provision for warranty expense	18,798	14,443
Warranty liability from acquired businesses	5,611	0
Warranty costs paid	22,054	16,568
Balance at end of period	49,446	45,042
Less long-term portion	19,010	15,320
Current portion of accrued warranty	30,436	$ 29,722	$ 32,451
CURT
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Warranty costs paid	$ 3,000