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, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease)
Balance at beginning of period	$ 26,204	$ 21,641	$ 17,325
Provision for warranty expense	20,985	17,267	12,860
Warranty liability from acquired businesses	125	240	688
Warranty costs paid	(14,921)	(12,944)	(9,232)
Balance at end of period	32,393	26,204	21,641
Less long-term portion	12,000	9,184	7,125
Current portion of accrued warranty	$ 20,393	$ 17,020	$ 14,516