Revenues (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Our revenues from contracts with customers disaggregated by revenue source, excluding sales-based taxes, were as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
Product sales	$	380,489	$	388,442	$	390,833
Extended warranties and services	9,226		11,572		7,954
Other(1)	7,038		6,170		7,252
Net sales	$	396,753	$	406,184	$	406,039

⁽¹⁾ Other revenue is primarily freight and delivery and royalty income.

Our revenues disaggregated by geographic region, based on ship-to address, were as follows (in thousands):

	Year Ended December 31,
	2018		2017		2016
United States	$	348,712	$	352,703	$	353,893
Canada	20,489		25,589		26,005
All other	27,552		27,892		26,141
Net sales	$	396,753	$	406,184	$	406,039

Contract with Customer, Asset and Liability

The following table provides information about our liabilities from contracts with customers, primarily customer deposits and deferred revenue for which advance consideration is received prior to the transfer of control. Revenue is recognized when transfer of control occurs. All customer deposits and deferred revenue received are short-term in nature. Significant changes in contract liabilities balances, including revenue recognized in the reporting period that was included in opening contract liabilities, are shown below (in thousands):

	2018			2017			2016
Balance, January 1	$	1,084		$	1,095		$	315
Cash additions	1,794			2,019			882
Revenue recognition	(2,062		)	(2,030		)	(102		)
Balance, December 31	$	816		$	1,084		$	1,095