Product Warranties (Tables)

6 Months Ended

Jun. 30, 2011

Product Warranties [Abstract]

Summary of changes in product warranties reserve

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
Warranty reserve, beginning of period	$	65,330		$	65,082		$	69,787		$	64,417
Provision		8,041			14,452			11,773			22,673
Payments		(10,567	)		(9,353	)		(18,756	)		(16,909	)
Warranty reserve, end of period	$	62,804		$	70,181		$	62,804		$	70,181