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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 26, 2022
May 03, 2021
Jul. 15, 2020
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]          
Total capitalization       $ 1,724,791 $ 1,495,398
Cumulative Preferred Shares          
Class of Stock [Line Items]          
Preferred stock, shares authorized (in shares)       1,500,000  
Preferred stock, shares outstanding (in shares)       0 0
Cumulative Preference Shares          
Class of Stock [Line Items]          
Preferred stock, shares authorized (in shares)       1,000,000  
Preferred stock, shares outstanding (in shares)       0  
OTP          
Class of Stock [Line Items]          
Equity to total capitalization (as a percent)       52.50%  
Net assets restricted from distribution       $ 681,200  
Minimum | Minnesota Public Utilities Commission | OTP          
Class of Stock [Line Items]          
Public utilities, requested equity capital structure (as a percent)     47.50%    
Minimum | Minnesota Public Utilities Commission | OTP | Subsequent Event          
Class of Stock [Line Items]          
Public utilities, approved equity capital structure (as a percent) 48.00%        
Maximum | OTP          
Class of Stock [Line Items]          
Total capitalization       $ 1,700,000  
Maximum | OTP | Subsequent Event          
Class of Stock [Line Items]          
Total capitalization $ 1,700,000        
Maximum | Minnesota Public Utilities Commission | OTP          
Class of Stock [Line Items]          
Public utilities, requested equity capital structure (as a percent)     58.10%    
Maximum | Minnesota Public Utilities Commission | OTP | Subsequent Event          
Class of Stock [Line Items]          
Public utilities, approved equity capital structure (as a percent) 58.70%        
Second Shelf Registration          
Class of Stock [Line Items]          
Shelf registration (in shares)   1,500,000      
Number of shares issued (in shares)       115,180  
Number of shares available for grant (in shares)       1,384,820