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Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | $ 5,553,188 | $ 5,348,705
OCI (loss) before reclassifications | 292 |
Amounts reclassified from accumulated other comprehensive loss | 1,225 | 1,207
Balance at end of period | 5,596,832 | 5,381,725
Pension and Other Postretirement Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (56,522) | (45,997)
OCI (loss) before reclassifications | 0 |
Amounts reclassified from accumulated other comprehensive loss | 1,205 | 879
Balance at end of period | (55,317) | (45,118)
Derivative Instruments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (574) | (1,711)
OCI (loss) before reclassifications | 292 |
Amounts reclassified from accumulated other comprehensive loss | 20 | 328
Balance at end of period | (262) | (1,383)
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (57,096) | (47,708)
Balance at end of period | (55,579) | (46,501)
APS |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 5,998,803 | 5,786,797
OCI (loss) before reclassifications | 292 |
Amounts reclassified from accumulated other comprehensive loss | 1,033 | 1,080
Balance at end of period | 6,040,344 | 5,821,026
APS | Pension and Other Postretirement Benefits |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (34,948) | (25,396)
OCI (loss) before reclassifications | 0 |
Amounts reclassified from accumulated other comprehensive loss | 1,013 | 752
Balance at end of period | (33,935) | (24,644)
APS | Derivative Instruments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (574) | (1,711)
OCI (loss) before reclassifications | 292 |
Amounts reclassified from accumulated other comprehensive loss | 20 | 328
Balance at end of period | (262) | (1,383)
APS | Accumulated Other Comprehensive Income (Loss) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (35,522) | (27,107)
Balance at end of period | $ (34,197) | $ (26,027)

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