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Schedule 1 - Condensed Financial Information of Registrant (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Related Party Transactions [Table Text Block] |
As of December 31, 2019: (in thousands) |  | Accounts Receivable |  |  | Interest Receivable |  |  | Current Notes Receivable |  |  | Long-Term Notes Receivable |  |  | Accounts Payable |  |  | Current Notes Payable |
Otter Tail Power Company |  | $ | 2,056 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 7 |  |  | $ | - |
Northern Pipe Products, Inc. |  |  | - |  |  |  | 8 |  |  |  | - |  |  |  | 5,351 |  |  |  | - |  |  |  | 3,056 |
Vinyltech Corporation |  |  | 4 |  |  |  | 17 |  |  |  | - |  |  |  | 11,500 |  |  |  | - |  |  |  | 15,099 |
BTD Manufacturing, Inc. |  |  | - |  |  |  | 77 |  |  |  | - |  |  |  | 52,000 |  |  |  | - |  |  |  | 18,474 |
T.O. Plastics, Inc. |  |  | - |  |  |  | 15 |  |  |  | - |  |  |  | 10,400 |  |  |  | - |  |  |  | 3,099 |
Varistar Corporation |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 49,883 |
Otter Tail Assurance Limited |  |  | 84 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
|  | $ | 2,144 |  |  | $ | 117 |  |  | $ | - |  |  | $ | 79,251 |  |  | $ | 7 |  |  | $ | 89,611 |
As of December 31, 2018: (in thousands) |  | Accounts Receivable |  |  | Interest Receivable |  |  | Current Notes Receivable |  |  | Long-Term Notes Receivable |  |  | Accounts Payable |  |  | Current Notes Payable |
Otter Tail Power Company |  | $ | 1,877 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 7 |  |  | $ | - |
Northern Pipe Products, Inc. |  |  | - |  |  |  | 8 |  |  |  | - |  |  |  | 5,522 |  |  |  | - |  |  |  | 5,623 |
Vinyltech Corporation |  |  | 4 |  |  |  | 17 |  |  |  | - |  |  |  | 11,500 |  |  |  | - |  |  |  | 15,305 |
BTD Manufacturing, Inc. |  |  | - |  |  |  | 77 |  |  |  | 415 |  |  |  | 52,000 |  |  |  | - |  |  |  | - |
T.O. Plastics, Inc. |  |  | - |  |  |  | 15 |  |  |  | - |  |  |  | 10,400 |  |  |  | - |  |  |  | 14,308 |
Varistar Corporation |  |  | - |  |  |  | - |  |  |  | 752 |  |  |  | - |  |  |  | - |  |  |  | 25,390 |
Otter Tail Assurance Limited |  |  | 50 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
|  | $ | 1,931 |  |  | $ | 117 |  |  | $ | 1,167 |  |  | $ | 79,422 |  |  | $ | 7 |  |  | $ | 60,626 |
Cash Dividends Paid to Parent by Subsidiaries [Table Text Block] |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Cash Dividends Paid to Parent by Subsidiaries |  | $ | 55,660 |  |  | $ | 53,134 |  |  | $ | 50,571 |
Parent Company [Member] |
Notes Tables |
Condensed Balance Sheet [Table Text Block] |
SCHEDULE 1 - Condensed financial information of registrant |
Otter Tail Corporation (PARENT COMPANY) |
Condensed Balance Sheets, December 31 |
(in thousands) |  | 2019 |  |  | 2018 |
Assets |  |  |  |  |  |  |  |
Current Assets |  |  |  |  |  |  |  |
Cash and Cash Equivalents |  | $ | 4,959 |  |  | $ | - |
Accounts Receivable |  |  | - |  |  |  | - |
Accounts Receivable from Subsidiaries |  |  | 2,144 |  |  |  | 1,931 |
Interest Receivable from Subsidiaries |  |  | 117 |  |  |  | 117 |
Notes Receivable from Subsidiaries |  |  | - |  |  |  | 1,167 |
Income Taxes Receivable |  |  | 1,487 |  |  |  | - |
Other |  |  | 1,050 |  |  |  | 3,482 |
Total Current Assets |  |  | 9,757 |  |  |  | 6,697 |
Investments in Subsidiaries |  |  | 860,646 |  |  |  | 787,869 |
Notes Receivable from Subsidiaries |  |  | 79,251 |  |  |  | 79,422 |
Deferred Income Taxes |  |  | 25,505 |  |  |  | 21,100 |
Right of Use Assets - Operating |  |  | 637 |  |  |  | - |
Other Assets |  |  | 35,503 |  |  |  | 31,547 |
Total Assets |  | $ | 1,011,299 |  |  | $ | 926,635 |
Liabilities and Equity |  |  |  |  |  |  |  |
Current Liabilities |  |  |  |  |  |  |  |
Short-Term Debt |  | $ | 6,000 |  |  | $ | 9,215 |
Current Maturities of Long-Term Debt |  |  | 183 |  |  |  | 172 |
Accounts Payable to Subsidiaries |  |  | 7 |  |  |  | 7 |
Notes Payable to Subsidiaries |  |  | 89,611 |  |  |  | 60,626 |
Current Operating Lease Liabilities |  |  | 156 |  |  |  | - |
Other |  |  | 9,473 |  |  |  | 9,994 |
Total Current Liabilities |  |  | 105,430 |  |  |  | 80,014 |
Long Term Operating Lease Liabilities |  |  | 533 |  |  |  | - |
Other Noncurrent Liabilities |  |  | 44,042 |  |  |  | 37,814 |
Commitments and Contingencies |  |  |  |  |  |  |  |
Capitalization |  |  |  |  |  |  |  |
Long-Term Debt, Net of Current Maturities |  |  | 79,812 |  |  |  | 79,944 |
Common Shareholder Equity |  |  | 781,482 |  |  |  | 728,863 |
Total Capitalization |  |  | 861,294 |  |  |  | 808,807 |
Total Liabilities and Equity |  | $ | 1,011,299 |  |  | $ | 926,635 |
Condensed Income Statement [Table Text Block] |
Otter Tail Corporation (PARENT COMPANY) |
Condensed Statements of Income--For the Years Ended December 31 |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Operating Loss |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | $ | - |  |  | $ | - |  |  | $ | - |
Operating Expenses |  |  | 10,529 |  |  |  | 9,916 |  |  |  | 7,138 |
Operating Loss |  |  | (10,529 | ) |  |  | (9,916 | ) |  |  | (7,138 | )
Other Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |
Equity Income in Earnings of Subsidiaries |  |  | 93,731 |  |  |  | 91,446 |  |  |  | 82,715 |
Interest Charges |  |  | (4,863 | ) |  |  | (4,043 | ) |  |  | (4,270 | )
Interest Charges to Subsidiaries |  |  | (306 | ) |  |  | (387 | ) |  |  | (244 | )
Interest Income from Subsidiaries |  |  | 3,063 |  |  |  | 2,839 |  |  |  | 2,848 |
Nonservice Cost Components of Postretirement Benefits |  |  | (1,297 | ) |  |  | (1,422 | ) |  |  | (1,215 | )
Other Income |  |  | 1,566 |  |  |  | 550 |  |  |  | 1,054 |
Total Other Income |  |  | 91,894 |  |  |  | 88,983 |  |  |  | 80,888 |
Income Before Income Taxes |  |  | 81,365 |  |  |  | 79,067 |  |  |  | 73,750 |
Income Tax (Benefit) Expense |  |  | (5,482 | ) |  |  | (3,278 | ) |  |  | 1,311 |
Net Income |  | $ | 86,847 |  |  | $ | 82,345 |  |  | $ | 72,439 |
Condensed Cash Flow Statement [Table Text Block] |
Otter Tail Corporation (PARENT COMPANY) |
Condensed Statements of Cash Flows--For the Years Ended December 31 |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |  |
Net Cash Provided by Operating Activities |  | $ | 52,263 |  |  | $ | 56,947 |  |  | $ | 50,205 |
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |  |
Investment in Subsidiaries |  |  | (34,990 | ) |  |  | (24,764 | ) |  |  | - |
Debt Repaid by Subsidiaries |  |  | 1,338 |  |  |  | 774 |  |  |  | 151 |
Cash Used in Investing Activities |  |  | (257 | ) |  |  | (623 | ) |  |  | (121 | )
Net Cash (Used in) Provided by Investing Activities |  |  | (33,909 | ) |  |  | (24,613 | ) |  |  | 30 |
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |  |
Change in Checks Written in Excess of Cash |  |  | (31 | ) |  |  | 31 |  |  |  | - |
Net Short-Term (Repayments) Borrowings |  |  | (3,215 | ) |  |  | 9,215 |  |  |  | - |
Borrowings from (Repayments to) Subsidiaries |  |  | 28,985 |  |  |  | (1,281 | ) |  |  | 23,389 |
Proceeds from Issuance of Common Stock |  |  | 20,338 |  |  |  | - |  |  |  | 4,349 |
Common Stock Issuance Expenses |  |  | (577 | ) |  |  | (108 | ) |  |  | - |
Payments for Retirement of Capital Stock |  |  | (2,730 | ) |  |  | (3,011 | ) |  |  | (1,799 | )
Short-Term and Long-Term Debt Issuance Expenses |  |  | (270 | ) |  |  | (164 | ) |  |  | (158 | )
Payments for Retirement of Long-Term Debt |  |  | (172 | ) |  |  | (189 | ) |  |  | (15,231 | )
Dividends Paid |  |  | (55,723 | ) |  |  | (53,198 | ) |  |  | (50,632 | )
Net Cash Used in Financing Activities |  |  | (13,395 | ) |  |  | (48,705 | ) |  |  | (40,082 | )
Net Change in Cash and Cash Equivalents |  |  | 4,959 |  |  |  | (16,371 | ) |  |  | 10,153 |
Cash and Cash Equivalents at Beginning of Period |  |  | - |  |  |  | 16,371 |  |  |  | 6,218 |
Cash and Cash Equivalents at End of Period |  | $ | 4,959 |  |  | $ | - |  |  | $ | 16,371 |

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