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Revenue From Contracts With Customers (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregated revenue
The following table provides information about disaggregated revenue by contract duration for the three- and six-month periods ended June 30, 2018 (in thousands): 
 
Well Intervention
 
Robotics
 
Production Facilities
 
Intercompany Elimination (1)
 
Total Revenue
Three months ended June 30, 2018
 
 
 
 
 
 
 
 
Short-term
$
61,935

 
$
30,738

 
$
—

 
$
—

 
$
92,673

Long-term (2)
99,824

 
8,322

 
16,343

 
(12,537
)
 
111,952

Total
$
161,759

 
$
39,060

 
$
16,343

 
$
(12,537
)
 
$
204,625

 
 
 
 
 
 
 
 
 
 
Six months ended June 30, 2018
 
 
 
 
 
 
 
 
Short-term
$
103,962

 
$
51,062

 
$
—

 
$
—

 
$
155,024

Long-term (2)
187,366

 
15,167

 
32,664

 
(21,334
)
 
213,863

Total
$
291,328

 
$
66,229

 
$
32,664

 
$
(21,334
)
 
$
368,887

(1)
Intercompany revenues between Robotics and Well Intervention 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.