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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
The changes in the carrying amount of goodwill from December 31, 2018 to March 31, 2019, were as follows (in thousands):
 
Drilling & Downhole
 
Completions
 
Production
 
Total
Goodwill Balance at December 31, 2018
$
191,151

 
$
259,280

 
$
19,216

 
$
469,647

Purchase accounting adjustments
427

 
—

 
—

 
427

Impact of non-U.S. local currency translation
68

 
485

 
47

 
600

Goodwill Balance at March 31, 2019
$
191,646

 
$
259,765

 
$
19,263

 
$
470,674


We perform our annual impairment tests of goodwill as of October 1 or when there is an indication an impairment may have occurred. There were no impairments of goodwill during the three months ended March 31, 2019 and 2018. Accumulated impairment losses on goodwill were $535.6 million as of March 31, 2019 and December 31, 2018.
Intangible assets
Intangible assets consisted of the following as of March 31, 2019 and December 31, 2018, respectively (in thousands):
 
March 31, 2019
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Amortizable Intangibles
 
Amortization Period (In Years)
Customer relationships
$
337,758

 
$
(115,819
)
 
$
221,939

 
4-15
Patents and technology
104,384

 
(18,855
)
 
85,529

 
5-17
Non-compete agreements
6,259

 
(5,694
)
 
565

 
3-6
Trade names
47,560

 
(19,336
)
 
28,224

 
10-15
Distributor relationships
22,160

 
(17,918
)
 
4,242

 
8-15
Trademarks
10,319

 
(509
)
 
9,810

 
15 - Indefinite
Intangible Assets Total
$
528,440

 
$
(178,131
)
 
$
350,309

 
 

 
December 31, 2018
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Amortizable Intangibles
 
Amortization Period (In Years)
Customer relationships
$
337,546

 
$
(110,228
)
 
$
227,318

 
4-15
Patents and technology
104,394

 
(17,148
)
 
87,246

 
5-17
Non-compete agreements
6,245

 
(5,600
)
 
645

 
3-6
Trade names
47,493

 
(18,107
)
 
29,386

 
10-15
Distributor relationships
22,160

 
(17,602
)
 
4,558

 
8-15
Trademarks
10,319

 
(424
)
 
9,895

 
15 - Indefinite
Intangible Assets Total
$
528,157

 
$
(169,109
)
 
$
359,048

 
 

Intangible assets with definite lives are tested for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. There were no intangible asset impairments during the three months ended March 31, 2019 and 2018.