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Revenue Recognition (Tables)
12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Revenues associated with contracts with customers for hydraulic fracturing services and equipment rental sales were as follows for the years ended December 31, 2018, 2017 and 2016:
Well Services Revenues(1)
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Hydraulic fracturing service revenues
$
56,620

 
$
49,266

 
$
30,965

Equipment rental revenues
4,455

 
3,525

 
2,789

Total well services revenues
$
61,075

 
$
52,791

 
$
33,754

__________________
(1)
Represents well services revenues excluding all intercompany revenues for work performed by the well services business segment for the Company’s working interests that are eliminated in consolidation and are therefore not included in well services revenues.
Revenues associated with contracts with customers for oil, natural gas and NGL sales were as follows for the years ended December 31, 2018, 2017 and 2016:
Exploration and Production Revenues
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Oil revenues
$
1,425,409

 
$
912,806

 
$
586,308

Purchased oil sales
540,633

 
132,331

 
10,272

Natural gas revenues
113,095

 
79,823

 
33,988

Purchased gas sales
6,078

 
1,211

 

NGL revenues
51,520

 
42,005

 
4,937

Total exploration and production revenues
$
2,136,735

 
$
1,168,176

 
$
635,505

Revenues associated with contracts with customers for midstream services were as follows for the years ended December 31, 2018, 2017 and 2016:
Midstream Revenues(1)
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Crude oil and natural gas revenues
$
73,028

 
$
37,369

 
$
5,186

Purchased oil sales
3,633

 

 

Purchased gas sales
1,464

 

 

Water revenues
46,012

 
35,383

 
30,220

Total midstream revenues
$
124,137

 
$
72,752

 
$
35,406

__________________
(1)
Represents midstream revenues excluding all intercompany revenues for work performed by the midstream services business segment for the Company’s working interests that are eliminated in consolidation and are therefore not included in midstream services revenues.
Estimated Revenue Satisfaction Period Related to Remaining Performance Obligations
The following table presents estimated revenue allocated to remaining performance obligations for contracted revenues that are unsatisfied (or partially satisfied) as of December 31, 2018:
 
(In thousands)
2019
$
24,879

2020
26,909

2021
25,656

2022
19,263

2023
12,642

Thereafter
14,642

Total
$
123,991