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v3.10.0.1

Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance |  |  | $ 18,414,613 | $ 9,119,247
(Gains) losses reclassified from accumulated OCI, net of tax | $ (292) | $ (1,338) | (793) | (3,673)
Ending Balance | 16,217,392 | 9,424,677 | 16,217,392 | 9,424,677
Cash flow hedge, net of tax | Natural gas cash flow hedges, net of tax |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance | 3,872 | 7,047 | 4,625 | 9,607
(Gains) losses reclassified from accumulated OCI, net of tax | (430) | (1,451) | (1,183) | (4,011)
Ending Balance | 3,442 | 5,596 | 3,442 | 5,596
Cash flow hedge, net of tax | Interest rate cash flow hedges, net of tax |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance | (475) | (627) | (555) | (699)
(Gains) losses reclassified from accumulated OCI, net of tax | 52 | 36 | 132 | 108
Ending Balance | (423) | (591) | (423) | (591)
Other post- retirement benefit liability adjustment, net of tax |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance | (6,356) | (6,713) | (6,528) | (6,866)
(Gains) losses reclassified from accumulated OCI, net of tax | 86 | 77 | 258 | 230
Ending Balance | (6,270) | (6,636) | (6,270) | (6,636)
Accumulated OCI, net of tax |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax |  |  |  |
Beginning Balance | (2,959) | (293) | (2,458) | 2,042
Ending Balance | $ (3,251) | $ (1,631) | $ (3,251) | $ (1,631)

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