. 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 lives of the contracts.

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

excluding the deferred revenue related to extended warranty coverage:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Balance at beginning of period	$	32,008		$	31,904		$	31,695		$	30,197
Product warranty reserve assumed in acquisition		-			-			43			840
Payments		(4,285	)		(4,900	)		(8,845	)		(8,552	)
Provision for warranty issued		4,086			4,220			8,246			7,702
Changes in estimates for pre-existing warranties		1,004			(489	)		1,674			548
Balance at end of period	$	32,813		$	30,735		$	32,813		$	30,735

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Balance at beginning of period	$	31,451		$	28,830		$	31,080		$	28,961
Deferred revenue contracts issued		6,898			1,619			8,867			2,763
Amortization of deferred revenue contracts		(1,632	)		(1,367	)		(3,230	)		(2,642	)
Balance at end of period	$	36,717		$	29,082		$	36,717		$	29,082

Product warranty obligations

and extended warranty related deferred revenues are included in the condensed consolidated balance sheets as follows:

	June 30, 2017		December 31, 2016
Product warranty liability
Current portion - other accrued liabilities	$	20,582	$	20,763
Long-term portion - other long-term liabilities		12,231		10,932
Total	$	32,813	$	31,695

Deferred revenue related to extended warranties
Current portion - other accrued liabilities	$	7,635	$	6,728
Long-term portion - other long-term liabilities		29,082		24,352
Total	$	36,717	$	31,080