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New Accounting Standards (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Net income | $ 171,612 | $ 172,317 | $ 179,706 | $ 200,502 |
Reclassification of income tax effect related to tax reform |  |  | (8,552) |  |
APS |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Net income | 182,699 | $ 173,982 | 197,170 | $ 202,017 |
Reclassification of income tax effect related to tax reform |  |  | (5,038) |  |
Accounting Standards Update 2017-07 |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Net income | $ 3,000 |  | 7,000 |  |
Accounting Standards Update 2017-07 | Scenario, Forecast |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Net periodic benefit cost (credit) |  |  |  |  | $ 15,000
Accounting Standards Update 2018-02 |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Reclassification of income tax effect related to tax reform |  |  | 9,000 |  |
Accounting Standards Update 2018-02 | APS |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Reclassification of income tax effect related to tax reform |  |  | $ 5,000 |  |

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