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Goodwill and intangible assets (Tables)
 3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill from December 31, 2015 to March 31, 2016, were as follows (in thousands):
 
Drilling & Subsea
 
Completions
 
Production & Infrastructure
 
Total
Goodwill Balance at December 31, 2015
$
334,595

 
$
316,914

 
$
17,527

 
$
669,036

Impact of non-U.S. local currency translation
326

 
1,619

 
209

 
$
2,154

Goodwill Balance at March 31, 2016
$
334,921

 
$
318,533

 
$
17,736

 
$
671,190
Summary of Intangible Assets
Intangible assets consisted of the following as of March 31, 2016 and December 31, 2015, respectively (in thousands):
  
March 31, 2016
 
Gross carrying
amount
 
Accumulated
amortization
 
Net amortizable
intangibles
 
Amortization
period (in years)
Customer relationships
$
280,381

 
$
(106,206
)
 
$
174,175

 
4-15
Patents and technology
34,359

 
(10,739
)
 
23,620

 
5-17
Non-compete agreements
7,295

 
(6,431
)
 
864

 
3-6
Trade names
45,601

 
(16,557
)
 
29,044

 
10-15
Distributor relationships
22,160

 
(14,126
)
 
8,034

 
8-15
Trademark
5,230

 
—

 
5,230

 
Indefinite
Intangible Assets Total
$
395,026

 
$
(154,059
)
 
$
240,967

 
 
  
December 31, 2015
 
Gross carrying
amount
 
Accumulated
amortization
 
Net amortizable
intangibles
 
Amortization
period (in years)
Customer relationships
$
280,297

 
$
(101,636
)
 
$
178,661

 
4-15
Patents and technology
34,140

 
(10,264
)
 
23,876

 
5-17
Non-compete agreements
7,269

 
(6,292
)
 
977

 
3-6
Trade names
45,446

 
(15,890
)
 
29,556

 
10-15
Distributor relationships
22,160

 
(13,810
)
 
8,350

 
8-15
Trademark
5,230

 
—

 
5,230

 
Indefinite
Intangible Assets Total
$
394,542

 
$
(147,892
)
 
$
246,650