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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2015
Public Utilities, Property, Plant and Equipment [Abstract]  
Schedule of Public Utility Property, Plant, and Equipment
Property, plant and equipment — net consisted of the following at December 31, 2015 and 2014:
(In thousands)
2015
 
2014
Property, plant and equipment
 
 
 
Regulated Operating Subsidiaries:
 
 
 
Property, plant and equipment in service
$
7,085,818

 
$
6,396,449

Construction work in progress
425,594

 
391,788

Capital equipment inventory
54,781

 
68,170

Other
12,550

 
13,151

ITC Holdings and other
18,609

 
15,534

Total
7,597,352

 
6,885,092

Less: Accumulated depreciation and amortization
(1,487,713
)
 
(1,388,217
)
Property, plant and equipment — net
$
6,109,639

 
$
5,496,875