. 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 contract.

The following is a tabular reconciliation of the product warranty liability, excluding the deferred revenue related to extended warranty coverage:

	Three Months E nded March 31 ,
	201 6			201 5

Balance at beginning of period	$	30,197		$	30,909
Product warranty reserve assumed in acquisition		840			-
Payments		(3,652	)		(5,433	)
Provision for warranties issued		3,482			4,549
Changes in estimates for pre-existing warranties		1,037			(748	)
Balance at end of period	$	31,904		$	29,277

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

	Three Months E nded March 31 ,
	201 6			201 5

Balance at beginning of period	$	28,961		$	27,193
Deferred revenue on extended warranty contracts sold		1,144			1,380
Amortization of deferred revenue on extended warranty contracts		(1,275	)		(1,042	)
Balance at end of period	$	28,830		$	27,531

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

	March 31 ,		December 31,
	201 6		201 5
Product warranty liability
Current portion - other accrued liabilities	$	23,433	$	21,726
Long-term portion - other long-term liabilities		8,471		8,471
Total	$	31,904	$	30,197

Deferred revenue related to extended warranty
Current portion - other accrued liabilities	$	5,189	$	6,026
Long-term portion - other long-term liabilities		23,641		22,935
Total	$	28,830	$	28,961