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Basis of Presentation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 1,385,160 | $ 1,587,289 | $ 1,362,928 | $ 1,197,373 | $ 1,378,213 | $ 1,563,799 | $ 1,303,573 | $ 1,091,191 | $ 5,532,750 | $ 5,336,776 | $ 4,531,552
Receivables, net | 873,986 |  |  |  | 836,605 |  |  |  | 873,986 | 836,605 |
Operating expenses | 1,239,270 | 1,383,578 | 1,224,674 | 1,140,303 | 1,247,992 | 1,374,329 | 1,206,262 | 1,026,973 | 4,987,825 | 4,855,556 | 4,129,829
Net income | 112,294 | $ 153,078 | $ 99,703 | 25,130 | 95,065 | $ 137,637 | $ 61,825 | $ 40,926 | 390,205 | 335,453 | $ 272,318
Accumulated other comprehensive loss | (48,078) |  |  |  | (42,102) |  |  |  | (48,078) | (42,102) |
Regulatory liabilities | 428,075 |  |  |  | $ 447,370 |  |  |  | 428,075 | $ 447,370 |
Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  | (7,700) |  |  |  |  |  |  |
Receivables, net |  |  |  | (7,700) |  |  |  |  |  |  |
Operating expenses |  |  |  | 1,200 |  |  |  |  |  |  |
Accounts Payable |  |  |  | 1,200 |  |  |  |  |  |  |
Net income | 4,400 |  |  | $ (6,700) |  |  |  |  |  |  |
Other Income | 6,500 |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | (2,700) |  |  |  |  |  |  |  | (2,700) |  |
Regulatory liabilities | $ (3,800) |  |  |  |  |  |  |  | $ (3,800) |  |

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