Accrued Expenses And Other Current Liabilities (Schedule Of Accrued Expenses And Other Current Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Payables and Accruals [Abstract]
Employee compensation and benefits	$ 26,673	$ 39,365	$ 31,202
Current portion of accrued warranty	24,813	23,055	20,397
Taxes payable	8,916	3,561	14,624
Customer rebates	11,589	11,124	10,440
Other	37,827	25,744	24,357
Accrued expenses and other current liabilities	$ 109,818	$ 102,849	$ 101,020