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v3.20.4

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net income | $ 390,205 | $ 335,453 | $ 272,318
Other comprehensive income (loss): |  |  |
Reclassification adjustment for loss on derivative instruments included in net income, tax | 145 | (140) | 429
Reclassification adjustment for loss on derivative instruments included in net income, net of tax | 446 | 731 | 162
Postretirement liability adjustment: |  |  |
Postretirement liability gains (losses) arising during the period, tax | (2,606) | (2,012) | 1,471
Postretirment liability gains (losses) arising during the period, net of tax | (8,395) | (6,151) | 4,441
Amortization of postretirement liability losses in net periodic benefit cost, tax | 630 | 476 | 721
Amortization of postretirement liability losses included in net periodic benefit cost, net of tax | 1,922 | 1,486 | 2,173
Postretirement liability adjustment | (6,473) | (4,665) | 6,614
Foreign currency translation adjustment: |  |  |
Foreign currency translation adjustment recognized during the period, tax | 0 | 0 | (14)
Foreign currency translation adjustment recognized during the period, net of tax | 0 | 0 | (61)
Reclassification adjustment for foreign currency translation adjustment included in net income, tax | 0 | 0 | 75
Reclassification adjustment for foreign currency translation adjustment included in net income, net of tax | 0 | 0 | 249
Foreign currency translation adjustment | 0 | 0 | 188
Net unrealized gain (loss) on available-for-sale investments: |  |  |
Net unrealized gain (loss) on available-for-sale investments arising during the period, tax | 0 | 35 | (38)
Net unrealized gain (loss) on available-for-sale investments arising during the period, net of tax | (1) | 134 | (144)
Reclassification adjustment for loss on available-for-sale investments included in net income, tax | 14 | 10 | 35
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax | 52 | 40 | 131
Net unrealized gain (loss) on available-for-sale investments | 51 | 174 | (13)
Other comprehensive income (loss) | (5,976) | (3,760) | 6,951
Comprehensive income attributable to common stockholders | $ 384,229 | $ 331,693 | $ 279,269

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