Product Warranties (Tables)

12 Months Ended

Dec. 31, 2013

Product Warranties Disclosures [Abstract]

Warranty Accrual and Cost Activity

Our warranty accrual and cost activity is as follows (in thousands):

	December 31,
	2011	2012	2013
Balance, beginning of year	$982	$6,871	$4,455
Charges to operations	8,244	2,116	1,350
Deductions for costs incurred	(2,355)	(4,532)	(2,840)
Balance, end of year	$6,871	$4,455	$2,965