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Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Fair Value of Financial Assets and Liabilities |  |
Risk premium (as a percent) | 1.83% |
Advances for construction | $ 196,853 | $ 191,062
Cost |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 806,938 | 808,622
Advances for construction | 196,853 | 191,062
Total | 1,003,791 | 999,684
Fair Value |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 991,973 | 873,454
Advances for construction | 82,150 | 79,550
Total | 1,074,123 | 953,004
Fair Value | Level 1 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 0 | 0
Advances for construction | 0 | 0
Total | 0 | 0
Fair Value | Level 2 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 991,973 | 873,454
Advances for construction | 82,150 | 79,550
Total | 1,074,123 | 953,004
Fair Value | Level 3 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 0 | 0
Advances for construction | 0 | 0
Total | $ 0 | $ 0

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