9.	Product Warranty Obligations

The Company records a liability for product warranty obligations at the time of sale to a customer based upon historical warranty experience. The Company also records a liability for specific warranty matters when they become known and are reasonably estimable.

Additionally, the Company sells extended warranty coverage for certain products. The sales of extended warranties are recorded as deferred revenue, which is recognized over the life of the contracts.

The following is a tabular reconciliation of the product warranty liability,

excluding the deferred revenue related to our extended warranty coverage:

	Year Ended December 31,
	2016			2015			2014
Balance at beginning of period	$	30,197		$	30,909		$	33,734
Product warranty reserve assumed in acquisition		840			351			360
Payments		(18,691	)		(21,686	)		(20,975	)
Provision for warranty issued		19,148			20,823			22,890
Changes in estimates for pre-existing warranties		201			(200	)		(5,100	)
Balance at end of period	$	31,695		$	30,197		$	30,909

The following is a tabular reconciliation of the deferred revenue related to extended warranty coverage

	Year Ended December 31,
	2016			2015			2014
Balance at beginning of period	$	28,961		$	27,193		$	23,092
Deferred revenue contracts assumed in acquisition		-			291			-
Deferred revenue contracts issued		7,733			5,978			7,343
Amortization of deferred revenue contracts		(5,614	)		(4,501	)		(3,242	)
Balance at end of period	$	31,080		$	28,961		$	27,193

Product warranty obligations and warranty

related deferred revenues are included in the balance sheets as follows:

	December 31,
	2016		2015
Product warranty liability
Current portion - other accrued liabilities	$	20,763	$	21,726
Long-term portion - other long-term liabilities		10,932		8,471
Total	$	31,695	$	30,197

Deferred revenue related to extended warranties
Current portion - other accrued liabilities	$	6,728	$	6,026
Long-term portion - other long-term liabilities		24,352		22,935
Total	$	31,080	$	28,961