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Schedule I - Condensed Financial Information of Registrant - Related Party Transactions (Details) - Otter Tail Corporation - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | $ 3,278 | $ 2,817
Interest Receivable from Subsidiaries | 117 | 117
Current Notes Receivable | 0 | 6,767
Notes Receivable from Subsidiaries | 78,900 | 78,900
Accounts Payable | 7 | 181
Notes Payable to Subsidiaries | 420,363 | 190,204
Otter Tail Power Company |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 3,016 | 2,503
Interest Receivable from Subsidiaries | 0 | 0
Current Notes Receivable | 0 | 0
Notes Receivable from Subsidiaries | 0 | 0
Accounts Payable | 7 | 7
Notes Payable to Subsidiaries | 0 | 0
Northern Pipe Products, Inc. |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 0 | 0
Interest Receivable from Subsidiaries | 7 | 7
Current Notes Receivable | 0 | 0
Notes Receivable from Subsidiaries | 5,000 | 5,000
Accounts Payable | 0 | 4
Notes Payable to Subsidiaries | 77,182 | 32,057
Vinyltech Corporation |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 0 | 13
Interest Receivable from Subsidiaries | 18 | 18
Current Notes Receivable | 0 | 0
Notes Receivable from Subsidiaries | 11,500 | 11,500
Accounts Payable | 0 | 0
Notes Payable to Subsidiaries | 90,425 | 34,881
BTD Manufacturing, Inc. |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 0 | 0
Interest Receivable from Subsidiaries | 77 | 77
Current Notes Receivable | 0 | 6,767
Notes Receivable from Subsidiaries | 52,000 | 52,000
Accounts Payable | 0 | 170
Notes Payable to Subsidiaries | 693 | 0
T.O. Plastics, Inc. |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 20 | 20
Interest Receivable from Subsidiaries | 15 | 15
Current Notes Receivable | 0 | 0
Notes Receivable from Subsidiaries | 10,400 | 10,400
Accounts Payable | 0 | 0
Notes Payable to Subsidiaries | 5,855 | 5,995
Varistar Corporation |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 0 | 0
Interest Receivable from Subsidiaries | 0 | 0
Current Notes Receivable | 0 | 0
Notes Receivable from Subsidiaries | 0 | 0
Accounts Payable | 0 | 0
Notes Payable to Subsidiaries | 246,208 | 117,271
Otter Tail Assurance Limited |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 242 | 281
Interest Receivable from Subsidiaries | 0 | 0
Current Notes Receivable | 0 | 0
Notes Receivable from Subsidiaries | 0 | 0
Accounts Payable | 0 | 0
Notes Payable to Subsidiaries | $ 0 | $ 0

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