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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 9 Months Ended
Aug. 29, 2023
May 03, 2021
Sep. 30, 2023
Dec. 31, 2022
Class of Stock [Line Items]        
Total capitalization     $ 2,226,927 $ 2,041,138
Otter Tail Power Company        
Class of Stock [Line Items]        
Equity to total capitalization ratio     55.00%  
Net assets restricted from distribution     $ 743,500  
Minimum | Otter Tail Power Company | Minnesota Public Utilities Commission        
Class of Stock [Line Items]        
Public utilities, requested equity capital structure, percentage 48.30%      
Maximum | Otter Tail Power Company        
Class of Stock [Line Items]        
Total capitalization     $ 2,000,000  
Maximum | Otter Tail Power Company | Minnesota Public Utilities Commission        
Class of Stock [Line Items]        
Public utilities, requested equity capital structure, percentage 59.10%      
Second Shelf Registration        
Class of Stock [Line Items]        
Shelf registration (in shares)   1,500,000    
Number of shares issued (in shares)     81,374  
Number of shares available for grant (in shares)     1,169,619