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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill [Line Items]  
Goodwill
The table below presents changes in the carrying amount of goodwill and our accumulated impairment losses (in thousands):

Goodwill (gross) at December 31, 2015
$
182,027

Acquired goodwill
12,696

Foreign currency translation adjustments
(49
)
Goodwill (gross) at December 31, 2016
194,674

 
 
Accumulated impairment losses at December 31, 2015
(9,266
)
Goodwill impairment
(613
)
Accumulated impairment losses at December 31, 2016
(9,879
)
 
 
Goodwill (net) at December 31, 2016
$
184,795

 
 
Goodwill (gross) at December 31, 2016
$
194,674

Acquired goodwill
3,068

Foreign currency translation adjustments
1,572

Goodwill (gross) at December 31, 2017
199,314

 
 
Accumulated impairment losses at December 31, 2016
(9,879
)
Goodwill impairment
—

Accumulated impairment losses at December 31, 2017
(9,879
)
 
 
Goodwill (net) at December 31, 2017
$
189,435
Other intangible assets
Other intangible assets consisted of the following (in thousands):

 
December 31,
 
2017
 
2016
Horizon tradename (indefinite life)
$
8,400

 
$
8,400

Pool Systems tradename and trademarks (indefinite lives)
1,109

 
1,023

National Pool Tile (NPT) tradename (20 year life)
1,500

 
1,500

Non-compete agreements (5 year weighted average useful life)
5,078

 
4,396

Patents (5 year weighted average useful life)
523

 
483

Other intangible assets
16,610

 
15,802

Less: Accumulated amortization
(3,387
)
 
(2,476
)
Other intangible assets, net
$
13,223

 
$
13,326
Estimated amortization expense for other intangible assets for next five years
The table below presents estimated amortization expense for other intangible assets for the next five years (in thousands):

2018
 
$
1,080

2019
 
905

2020
 
833

2021
 
353

2022
 
163