Product Warranty Liabilities (Tables)

6 Months Ended

Jun. 30, 2013

Product Warranties Disclosures [Abstract]

Summary of Activity in Product Warranty Liability

The following table summarizes the activity in the Company’s product warranty liabilities:

	2012			2013
Reserve at January 1	$	27,400		$	30,139
Additions		13,104			9,712
Payments		(10,134	)		(9,323	)
Reserve at June 30	$	30,370		$	30,528