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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Net income | $ 25,130 | $ 40,926
Other comprehensive income: |  |
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $36 and $(249) for the three months ended in 2020 and 2019, respectively | 111 | 397
Postretirement liability adjustment: |  |
Amortization of postretirement liability losses included in net periodic benefit cost, net of tax of $149 and $100 for the three months ended in 2020 and 2019, respectively | 462 | 310
Net unrealized gain on available-for-sale investments: |  |
Net unrealized gain on available-for-sale investments arising during the period, net of tax of $36 and $10 for the three months ended in 2020 and 2019, respectively | 135 | 39
Reclassification adjustment for (gain) loss on available-for-sale investments included in net income, net of tax of $0 and $7 for the three months ended in 2020 and 2019, respectively | (1) | 28
Net unrealized gain on available-for-sale investments | 134 | 67
Other comprehensive income | 707 | 774
Comprehensive income attributable to common stockholders | $ 25,837 | $ 41,700

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