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Jointly owned facilities (Tables)
 12 Months Ended
Dec. 31, 2019
Regulated Operations [Abstract]  
Company's share of the cost of utility plant in service and related accumulated depreciation for the stations
At December 31, the Company's share of the cost of utility plant in service, construction work in progress and related accumulated depreciation for the jointly owned facilities was as follows:
 
Ownership Percentage

2019

2018

 
 
(In thousands)
Big Stone Station:
22.7
%
 
 
Utility plant in service
 
$
152,836

$
156,534

Construction work in progress
 
518

92

Less accumulated depreciation
 
46,266

49,345

 
 
$
107,088

$
107,281

BSSE:
50.0
%
 
 
Utility plant in service
 
$
105,767

$
—

Construction work in progress
 
—

105,846

Less accumulated depreciation
 
1,232

—

 
 
$
104,535

$
105,846

Coyote Station:
25.0
%
 
 
Utility plant in service
 
$
160,235

$
155,236

Construction work in progress
 
21

1,920

Less accumulated depreciation
 
107,638

105,565

 
 
$
52,618

$
51,591

Wygen III:
25.0
%
 
 
Utility plant in service
 
$
67,869

$
65,382

Construction work in progress
 
112

220

Less accumulated depreciation
 
10,482

9,174

 
 
$
57,499

$
56,428