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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2013
$
181,240

Acquired goodwill
3,907

Foreign currency translation adjustments
(1,957
)
Goodwill (gross) at December 31, 2014
183,190

 
 
Accumulated impairment losses at December 31, 2013
(9,266
)
Goodwill impairment
—

Accumulated impairment losses at December 31, 2014
(9,266
)
 
 
Goodwill (net) at December 31, 2014
$
173,924

 
 
Goodwill (gross) at December 31, 2014
$
183,190

Acquired goodwill
1,149

Foreign currency translation adjustments
(2,312
)
Goodwill (gross) at December 31, 2015
182,027

 
 
Accumulated impairment losses at December 31, 2014
(9,266
)
Goodwill impairment
—

Accumulated impairment losses at December 31, 2015
(9,266
)
 
 
Goodwill (net) at December 31, 2015
$
172,761
Other intangible assets
Other intangible assets consisted of the following (in thousands):

 
December 31,
 
2015
 
2014
Horizon tradename (indefinite life)
$
8,400

 
$
8,400

Pool Systems tradename and trademarks (indefinite lives)
1,040

 
1,162

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

 
1,500

Non-compete agreements (5 year weighted average useful life)
1,953

 
2,599

Patents (16 year weighted average useful life)
492

 
549

Other intangible assets
13,385

 
14,210

Less: Accumulated amortization
(1,540
)
 
(2,215
)
Other intangible assets, net
$
11,845

 
$
11,995
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):

2016
 
$
434

2017
 
407

2018
 
405

2019
 
268

2020
 
222