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Debt: - Maturities for long-term debt and capital lease obligations and debt outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt    
Principal $ 8,304,523 $ 7,575,027
Unamortized Debt Issuance Costs and Debt Discounts 101,260 $ 97,988
Maturities for long-term debt and capital lease obligations    
2017 316,861  
2018 214,224  
2019 551,235  
2020 367,150  
2021 $ 220,402  
Long-term debt.    
Debt    
Weighted average interest rate on long-term debt 4.34% 4.45%
Maturities for long-term debt and capital lease obligations    
2017 $ 310,426  
2018 209,319  
2019 545,773  
2020 361,068  
2021 213,630  
Facility    
Debt    
Principal 4,259,723 $ 3,777,540
Unamortized Debt Issuance Costs and Debt Discounts 55,754 56,851
Maturities for long-term debt and capital lease obligations    
2017 183,259  
2018 151,297  
2019 156,376  
2020 171,441  
2021 176,620  
FMBs    
Debt    
Principal 3,058,083 2,809,093
Unamortized Debt Issuance Costs and Debt Discounts 36,717 32,002
Maturities for long-term debt and capital lease obligations    
2017 1,010  
2018 1,010  
2019 351,010  
2020 1,010  
2021 1,010  
PCBs    
Debt    
Principal 980,770 980,770
Unamortized Debt Issuance Costs and Debt Discounts 8,789 9,135
Maturities for long-term debt and capital lease obligations    
2017 122,620  
2018 56,028  
2019 37,352  
2020 188,226  
2021 36,000  
Series 2009 and Series 2010 bonds    
Maturities for long-term debt and capital lease obligations    
2018 56,000  
2019 37,000  
2020 152,000  
CFC    
Debt    
Principal 3,347 4,238
Maturities for long-term debt and capital lease obligations    
2017 937  
2018 984  
2019 1,035  
2020 391  
CoBank    
Debt    
Principal 2,600 $ 3,386
Maturities for long-term debt and capital lease obligations    
2017 2,600  
Capital Lease Obligations.    
Maturities for long-term debt and capital lease obligations    
2017 6,435  
2018 4,905  
2019 5,462  
2020 6,082  
2021 $ 6,772