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Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Fair Value of Financial Assets and Liabilities |  |
Risk premium (as a percent) | 1.70% |
Advances for construction | $ 186,877 | $ 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 | 868,919 | 849,551
Advances for construction | 79,400 | 77,204
Total | 948,319 | 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 | 815,612 | 814,938
Advances for construction | 186,877 | 186,342
Total | 1,002,489 | 1,001,280
Total |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 868,919 | 849,551
Advances for construction | 79,400 | 77,204
Total | $ 948,319 | $ 926,755

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- Definition For utilities only, represents the carrying amount of the liability as of the balance sheet date for payments received by a utility from its customers in advance of performing its obligations under terms of its construction agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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