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Goodwill and intangible assets (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill from January 1, 2015 to December 31, 2016, were as follows (in thousands):
 
Drilling &
Subsea
Completions
Production & Infrastructure
Total
 
2016
2015
2016
2015
2016
2015
2016
2015
Goodwill Balance at January 1, net
$
334,595

$
472,891

$
316,914

$
307,448

$
17,527

$
18,142

$
669,036

$
798,481

Acquisitions, net of dispositions
—

—

—

13,977

—

—

—

13,977

Impairment
—

(123,200
)
—

—

—

—

—

(123,200
)
Impact of non-U.S. local currency translation
(17,189
)
(15,096
)
779

(4,511
)
117

(615
)
(16,293
)
(20,222
)
Goodwill Balance at December 31, net
$
317,406

$
334,595

$
317,693

$
316,914

$
17,644

$
17,527

$
652,743

$
669,036
Summary of Intangible Assets
At December 31, 2016 and 2015, intangible assets consisted of the following, respectively (in thousands):
  
December 31, 2016
 
Gross carrying
amount
 
Accumulated
amortization
 
Net amortizable
intangibles
 
Amortization
period (in years)
Customer relationships
$
270,586

 
$
(115,381
)
 
$
155,205

 
4-15
Patents and technology
33,936

 
(12,225
)
 
21,711

 
5-17
Non-compete agreements
6,230

 
(5,594
)
 
636

 
3-6
Trade names
44,494

 
(17,944
)
 
26,550

 
10-15
Distributor relationships
22,160

 
(15,074
)
 
7,086

 
8-15
Trademark
5,230

 
—

 
5,230

 
Indefinite
Intangible Assets Total
$
382,636

 
$
(166,218
)
 
$
216,418

 
 

  
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

 
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The total weighted average amortization period is 14 years and the estimated future amortization expense for the next five years is as follows (in thousands):
Year ending December 31,
 
 
2017
 
$
26,647

2018
 
26,556

2019
 
26,207

2020
 
24,295

2021
 
23,730