Accrued Expenses And Other Current Liabilities (Schedule Of Accrued Expenses And Other Current Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Payables and Accruals [Abstract]
Employee compensation and benefits	$ 42,646	$ 47,459	$ 45,299
Current portion of accrued warranty	23,558	20,393	19,607
Taxes payable	5,613	41	0
Customer rebates	11,120	9,329	10,998
Other	26,912	21,513	21,829
Accrued expenses and other current liabilities	$ 109,849	$ 98,735	$ 97,733