Warranties

The Company has warranties with various terms from eighteen months for parts to twenty-five years for certain heat exchangers. The Company has an obligation to replace parts or service its products if conditions under the warranty are met. A provision is made for estimated warranty costs at the time the related products are sold based upon the warranty period, historical trends, new products and any known identifiable warranty issues.

Changes in the warranty accrual are as follows:



	Three months ended						Nine months ended
	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Warranty accrual:	(in thousands)
Balance, beginning of period	$	6,766		$	6,575		$	5,776		$	6,093
Payments made	(1,477		)	(1,036		)	(3,394		)	(3,128		)
Provisions	2,238			1,129			5,145			3,703
Balance, end of period	$	7,527		$	6,668		$	7,527		$	6,668

Warranty expense:	$	2,289		$	1,129		$	5,332		$	3,703