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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following presents the categories within property, plant and equipment (in thousands):
 
June 30,
 
December 31,
 
2017
 
2016
Operating wind farms
$
4,346,605

 
$
3,707,823

Furniture, fixtures and equipment
10,947

 
9,307

Land
141

 
141

Subtotal
4,357,693

 
3,717,271

Less: accumulated depreciation
(675,424
)
 
(582,109
)
Property, plant and equipment, net
$
3,682,269

 
$
3,135,162