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Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Fair Value of Financial Assets and Liabilities |  |
Risk premium (as a percent) | 1.83% |
Advances for construction | $ 190,272 | $ 186,342
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
Level 2 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 912,402 | 849,551
Advances for construction | 79,818 | 77,204
Total | 992,220 | 926,755
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
Cost |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 812,758 | 814,938
Advances for construction | 190,272 | 186,342
Total | 1,003,030 | 1,001,280
Total |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 912,402 | 849,551
Advances for construction | 79,818 | 77,204
Total | $ 992,220 | $ 926,755

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