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Schedule 1 - Condensed Financial Information of Registrant - Related Party Transactions (Details) - Otter Tail Corporation - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | $ 2,817 | $ 2,734
Interest Receivable from Subsidiaries | 117 | 117
Current Notes Receivable | 6,767 | 0
Notes Receivable from Subsidiaries | 78,900 | 79,069
Accounts Payable | 181 | 7
Notes Payable to Subsidiaries | 190,204 | 134,352
OTP |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 2,503 | 2,698
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 | 8
Current Notes Receivable | 0 | 0
Notes Receivable from Subsidiaries | 5,000 | 5,169
Accounts Payable | 4 | 0
Notes Payable to Subsidiaries | 32,057 | 9,103
Vinyltech Corporation |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 13 | 0
Interest Receivable from Subsidiaries | 18 | 17
Current Notes Receivable | 0 | 0
Notes Receivable from Subsidiaries | 11,500 | 11,500
Accounts Payable | 0 | 0
Notes Payable to Subsidiaries | 34,881 | 18,004
BTD Manufacturing, Inc. |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 0 | 0
Interest Receivable from Subsidiaries | 77 | 77
Current Notes Receivable | 6,767 | 0
Notes Receivable from Subsidiaries | 52,000 | 52,000
Accounts Payable | 170 | 0
Notes Payable to Subsidiaries | 0 | 30,344
T.O. Plastics, Inc. |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 20 | 0
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 | 5,995 | 3,101
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 | 117,271 | 73,800
Otter Tail Assurance Limited |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable from Subsidiaries | 281 | 36
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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