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v3.20.2

Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 5,610,477 | $ 5,357,243 | $ 5,553,188 | $ 5,348,705
OCI (loss) before reclassifications | (659) |  | (3,924) | (2,422)
Amounts reclassified from accumulated other comprehensive loss | 1,043 | 1,098 | 3,529 | 3,592
Balance at end of period | 5,967,175 | 5,681,705 | 5,967,175 | 5,681,705
Pension and Other Postretirement Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (56,326) | (46,657) | (56,522) | (45,997)
OCI (loss) before reclassifications | 0 |  | (2,008) | (2,422)
Amounts reclassified from accumulated other comprehensive loss | 1,043 | 880 | 3,247 | 2,642
Balance at end of period | (55,283) | (45,777) | (55,283) | (45,777)
Derivative Instruments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (1,549) | (979) | (574) | (1,711)
OCI (loss) before reclassifications | (659) |  | (1,916) | 0
Amounts reclassified from accumulated other comprehensive loss | 0 | 218 | 282 | 950
Balance at end of period | (2,208) | (761) | (2,208) | (761)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (57,875) | (47,636) | (57,096) | (47,708)
Balance at end of period | (57,491) | (46,538) | (57,491) | (46,538)
APS |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 6,054,137 | 5,797,857 | 5,998,803 | 5,786,797
OCI (loss) before reclassifications |  |  | (1,659) | (2,414)
Amounts reclassified from accumulated other comprehensive loss | 900 | 973 | 3,056 | 3,218
Balance at end of period | 6,410,275 | 6,122,571 | 6,410,275 | 6,122,571
APS | Pension and Other Postretirement Benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (35,025) | (26,297) | (34,948) | (25,396)
OCI (loss) before reclassifications |  |  | (1,951) | (2,414)
Amounts reclassified from accumulated other comprehensive loss | 900 | 755 | 2,774 | 2,268
Balance at end of period | (34,125) | (25,542) | (34,125) | (25,542)
APS | Derivative Instruments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | (979) | (574) | (1,711)
OCI (loss) before reclassifications |  |  | 292 | 0
Amounts reclassified from accumulated other comprehensive loss | 0 | 218 | 282 | 950
Balance at end of period | 0 | (761) | 0 | (761)
APS | Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (35,025) | (27,276) | (35,522) | (27,107)
Balance at end of period | $ (34,125) | $ (26,303) | $ (34,125) | $ (26,303)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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