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Revenue From Contracts With Customers (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue
The following table provides information about disaggregated revenue by contract duration (in thousands): 
 
 
Well Intervention
 
Robotics
 
Production Facilities
 
Intercompany Eliminations (1)
 
Total Revenue
Three months ended March 31, 2019
 
 
 
 
 
 
 
 
 
 
Short-term
$
29,805

 
$
24,930

 
$
—

 
$
—

 
$
54,735

Long-term (2)
92,426

 
14,111

 
15,253

 
(9,702
)
 
112,088

Total
$
122,231

 
$
39,041

 
$
15,253

 
$
(9,702
)
 
$
166,823

 
 
 
 
 
 
 
 
 
 
 
Three months ended March 31, 2018
 
 
 
 
 
 
 
 
 
 
Short-term
$
42,027

 
$
20,324

 
$
—

 
$
—

 
$
62,351

Long-term (2)
87,542

 
6,845

 
16,321

 
(8,797
)
 
101,911

Total
$
129,569

 
$
27,169

 
$
16,321

 
$
(8,797
)
 
$
164,262

(1)
Intercompany revenues among our business segments are under agreements that are considered long-term.
(2)
Contracts are classified as long-term if all or part of the contract is to be performed over a period extending beyond 12 months from the effective date of the contract. Long-term contracts may include multi-year agreements whereby the commitment for services in any one year may be short in duration.