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Jointly owned facilities (Tables)
12 Months Ended
Dec. 31, 2013
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 and related accumulated depreciation for the stations was as follows:
 
2013

2012

 
(In thousands)
Big Stone Station:
 
 
Utility plant in service
$
63,890

$
63,146

Less accumulated depreciation
41,323

40,859

 
$
22,567

$
22,287

Coyote Station:
 

 

Utility plant in service
$
138,261

$
135,073

Less accumulated depreciation
89,528

87,524

 
$
48,733

$
47,549

Wygen III:
 

 

Utility plant in service
$
64,332

$
63,462

Less accumulated depreciation
4,639

3,368

 
$
59,693

$
60,094