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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Note 5. Property, Plant and Equipment
Property, plant and equipment, at cost, is as follows:
(in thousands)
June 30, 2018
 
December 31, 2017
Crude Oil, Natural Gas and Produced Water Gathering Systems and Facilities
$
954,329

 
$
451,275

Fresh Water Delivery Systems
78,232

 
76,745

Crude Oil Treating Facilities 
20,099

 
20,099

Construction-in-Progress (1)
279,171

 
157,920

Total Property, Plant and Equipment, at Cost
1,331,831

 
706,039

Accumulated Depreciation and Amortization
(58,414
)
 
(44,271
)
Property, Plant and Equipment, Net
$
1,273,417

 
$
661,768

(1) 
Construction-in-progress at June 30, 2018 includes $256.6 million in gathering system projects, $11.6 million in fresh water delivery system projects and $11.0 million in equipment for use in future projects. Construction-in-progress at December 31, 2017 includes $157.4 million in gathering system projects and $0.5 million in fresh water delivery system projects.