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Revenues (Tables)
 6 Months Ended
Jun. 30, 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):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Product sales
 
$
71,470

 
$
73,399

 
$
181,220

 
$
181,241

Extended warranties and services
 
1,737

 
2,061

 
5,219

 
5,862

Other(1)
 
2,291

 
1,569

 
3,872

 
3,178

Net sales
 
$
75,498

 
$
77,029

 
$
190,311

 
$
190,281

(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):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
United States
 
$
65,498

 
$
66,731

 
$
169,079

 
$
167,768

Canada
 
3,283

 
3,597

 
9,066

 
10,717

All other
 
6,717

 
6,701

 
12,166

 
11,796

Net sales
 
$
75,498

 
$
77,029

 
$
190,311

 
$
190,281
Contract with Customer, Asset and Liability [Table Text Block] The following table provides information about our liabilities from contracts with customers, primarily customer deposits and deferred revenue, all of which are short-term in nature. The revenue recognized from contract liabilities and the remaining balances are shown below (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Balance, beginning of period
$
693

 
$
1,066

 
$
1,084

 
$
1,096

Cash additions
304

 
314

 
993

 
1,060

Revenue recognition
(249
)
 
(424
)
 
(1,329
)
 
(1,200
)
Balance, end of period
$
748

 
$
956

 
$
748

 
$
956