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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
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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