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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill were as follows (in thousands):
 
Drilling & Downhole
Completions
Production
Total
Goodwill balance at December 31, 2016
$
529,901

$
105,198

$
17,644

$
652,743

Acquisitions, net of dispositions
19,571

133,914

1,595

155,080

Impairment
(68,004
)
—

—

(68,004
)
Impact of non-U.S. local currency translation
13,515

1,704

207

15,426

Goodwill balance at December 31, 2017
494,983

240,816

19,446

755,245

Acquisitions, net of dispositions
1,753

20,559

—

22,312

Impairment
(298,789
)
—

—

(298,789
)
Impact of non-U.S. local currency translation
(6,796
)
(2,095
)
(230
)
$
(9,121
)
Goodwill balance at December 31, 2018
$
191,151

$
259,280

$
19,216

$
469,647
Summary of Intangible Assets
At December 31, 2018 and 2017, intangible assets consisted of the following, respectively (in thousands):
 
December 31, 2018
 
Gross carrying
amount
 
Accumulated
amortization
 
Net 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
Trademark
10,319

 
(424
)
 
9,895

 
15 - Indefinite
Intangible Assets Total
$
528,157

 
$
(169,109
)
 
$
359,048

 
 

 
December 31, 2017
 
Gross carrying
amount
 
Accumulated
amortization
 
Net intangibles
 
Amortization
period (in years)
Customer relationships
$
428,544

 
$
(138,566
)
 
$
289,978

 
4 - 15
Patents and technology
110,910

 
(16,733
)
 
94,177

 
5 - 17
Non-compete agreements
6,625

 
(6,041
)
 
584

 
3 - 6
Trade names
64,359

 
(22,090
)
 
42,269

 
10 - 15
Distributor relationships
22,160

 
(16,338
)
 
5,822

 
8 - 15
Trademark
10,319

 
(85
)
 
10,234

 
15 - Indefinite
Intangible Assets Total
$
642,917

 
$
(199,853
)
 
$
443,064

 
 
Schedule of Future Amortization Expense
The estimated future amortization expense for the next five years is as follows (in thousands):
Year ending December 31,
 
Amount
2019
 
$
34,591

2020
 
33,864

2021
 
32,974

2022
 
31,196

2023
 
28,994