Warranty Accrual (Tables)

3 Months Ended

Mar. 31, 2012

Warranty Accrual [Abstract]

Warranty Accrual Activity

	Three Months Ended March 31,
	2012			2011
	(Dollars in thousands)
Balance at beginning of year	$	25,525		$	34,704
Expense provisions		765			841
Cash payments		(1,214	)		(1,499	)
Adjustments		—			(431	)
Balance at end of period	$	25,076		$	33,615