Warranty Contracts (Tables)

12 Months Ended

Dec. 31, 2016

Warranty Contracts [Abstract]

Schedule Of Recognized Warranty Revenue And Incurred Warranty Costs

Warranty Revenue Recognition:
(in thousands)	Beginning Balance Deferred Warranty Revenue		Warranty Revenue Deferred		Warranty Revenue Recognized		Ending Balance Deferred Warranty Revenue
Year Ended December 31,
2016	$	10,663	$	12,859	$	(14,471)	$	9,051
2015		11,914		15,349		(16,600)		10,663
2014		9,141		17,185		(14,412)		11,914
Warranty Costs Incurred:
(in thousands)			Materials		Labor and Overhead		Total
Year Ended December 31,
2016			$	6,851	$	6,862	$	13,713
2015				6,202		5,559		11,761
2014				5,958		5,440		11,398