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Jointly Owned Facilities (Tables)
 12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Jointly Owned Utility Plants
At December 31, 2019, our interests in jointly-owned generating facilities and transmission systems were (in thousands):
 
Plant in Service
Construction Work in Progress
Less Accumulated Depreciation
Plant Net of Accumulated Depreciation
Wyodak Plant
$
116,074

$
729

$
(64,413
)
$
52,390

Transmission Tie
$
19,862

$
4,161

$
(6,612
)
$
17,411

Wygen I
$
120,824

$
289

$
(48,703
)
$
72,410

Wygen III
$
146,161

$
400

$
(25,518
)
$
121,043