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Consolidated Statements of Capitalization - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt $ 6,000 $ 18,599
Long-term Debt 692,351 592,523
Less: Current Maturities--net of Unamortized Debt Issuance Costs 183 172
Unamortized Long-Term Debt Issuance Costs 2,587 2,349
Total Otter Tail Corporation Long-Term Debt net of Unamortized Debt Issuance Costs 689,581 590,002
Total Common Shareholders’ Equity 781,482 728,863
Total Capitalization 1,471,063 1,318,865
Parent Company [Member]    
Short-term Debt 6,000 9,215
Long-term Debt 80,351 80,523
Less: Current Maturities--net of Unamortized Debt Issuance Costs 183 172
Unamortized Long-Term Debt Issuance Costs 356 407
Total Otter Tail Corporation Long-Term Debt net of Unamortized Debt Issuance Costs 79,812 79,944
Total Common Shareholders’ Equity 781,482 728,863
Total Capitalization 861,294 808,807
Otter Tail Power Company [Member]    
Short-term Debt   9,384
Long-term Debt 612,000 512,000
Unamortized Long-Term Debt Issuance Costs 2,231 1,942
Total Otter Tail Corporation Long-Term Debt net of Unamortized Debt Issuance Costs 609,769 510,058
Otter Tail Corporation Credit Agreement [Member] | Parent Company [Member]    
Short-term Debt 6,000 9,215
Otter Tail Power Company Credit Agreement [Member] | Parent Company [Member]    
Short-term Debt 0 9,384
The 3.55% Guaranteed Senior Notes, due December 15, 2026 [Member] | Parent Company [Member]    
Long-term Debt 80,000 80,000
Partnership in Assisting Community Expansion Note, 2.54%, due March 18, 2021 [Member] | Parent Company [Member]    
Long-term Debt 351 523
Senior Unsecured Notes 4.63%, Due December 1, 2021 [Member]    
Long-term Debt 140,000 140,000
Senior Unsecured Notes 4.63%, Due December 1, 2021 [Member] | Otter Tail Power Company [Member]    
Long-term Debt 140,000 140,000
Senior Unsecured Notes 6.15%, Series B, Due August 20, 2022 [Member]    
Long-term Debt 30,000 30,000
Senior Unsecured Notes 6.15%, Series B, Due August 20, 2022 [Member] | Otter Tail Power Company [Member]    
Long-term Debt 30,000 30,000
Senior Unsecured Notes 6.37%, Series C, Due August 20, 2027 [Member]    
Long-term Debt 42,000 42,000
Senior Unsecured Notes 6.37%, Series C, Due August 20, 2027 [Member] | Otter Tail Power Company [Member]    
Long-term Debt 42,000 42,000
Senior Unsecured Notes 4.68%, Series A, Due February 27, 2029 [Member]    
Long-term Debt 60,000 60,000
Senior Unsecured Notes 4.68%, Series A, Due February 27, 2029 [Member] | Otter Tail Power Company [Member]    
Long-term Debt 60,000 60,000
Senior Unsecured notes 3.07%, Series 2019A, Due October 10, 2029 [Member] | Otter Tail Power Company [Member]    
Long-term Debt [1] 10,000 0
Senior Unsecured Notes 6.47%, Series D, Due August 20, 2037 [Member]    
Long-term Debt 50,000 50,000
Senior Unsecured Notes 6.47%, Series D, Due August 20, 2037 [Member] | Otter Tail Power Company [Member]    
Long-term Debt 50,000 50,000
Senior Unsecured Notes 3.52%, Series 2019B, Due October 10, 2039 [Member]    
Long-term Debt 26,000  
Senior Unsecured Notes 3.52%, Series 2019B, Due October 10, 2039 [Member] | Otter Tail Power Company [Member]    
Long-term Debt 26,000 0
Senior Unsecured Notes 5.47%, Series B, Due February 27, 2044 [Member]    
Long-term Debt 90,000 90,000
Senior Unsecured Notes 5.47%, Series B, Due February 27, 2044 [Member] | Otter Tail Power Company [Member]    
Long-term Debt 90,000 90,000
Senior Unsecured Notes 4.07%, Series 2018A, Due February 7, 2048 [Member]    
Long-term Debt 100,000 100,000
Senior Unsecured Notes 4.07%, Series 2018A, Due February 7, 2048 [Member] | Otter Tail Power Company [Member]    
Long-term Debt 100,000 100,000
Senior Unsecured Notes 3.82%, Sericies C, Due October 10, 2049 [Member]    
Long-term Debt 64,000  
Senior Unsecured Notes 3.82%, Sericies C, Due October 10, 2049 [Member] | Otter Tail Power Company [Member]    
Long-term Debt $ 64,000 $ 0
[1] Holder is COBANK, a cooperative lender. Interest payments are subject to cash credits which may result in a lower effective interest rate.