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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension and other post retirement obligations: |  |  |
Amortization of actuarial gains (losses) included in net periodic pension cost, gross | $ 8,379 | $ (2,563) | $ (12,647)
Tax effect | (2,012) | 605 | 3,087
Amortization of actuarial gains (losses) included in net periodic pension cost, net | 6,367 | (1,958) | (9,560)
Amortization of prior service cost included in net periodic pension cost, gross | (471) | (115) | (1,398)
Tax effect | 113 | 28 | 340
Amortization of prior service cost included in net periodic pension cost, net | (358) | (87) | (1,058)
Initial projected benefit obligation recognized upon plan adoption, gross | 0 | 0 | (775)
Tax effect | 0 | 0 | 189
Initial projected benefit obligation recognized upon plan adoption, net | 0 | 0 | (586)
Other comprehensive income/(loss) related to pension and other post retirement obligations, net of taxes | 6,009 | (2,045) | (11,204)
Unrealized gains/(losses) on available-for-sale securities: |  |  |
Net unrealized holding gains (losses) arising during period, gross | 87,237 | 53,988 | (39,894)
Tax effect | (20,943) | (13,176) | 9,700
Net unrealized holding gains (losses) arising during period, net | 66,294 | 40,812 | (30,194)
Reclassification of other comprehensive income due to change in accounting principle - equity securities | 0 | 0 | (208)
Reclassification adjustment for net (gains) included in net income, gross | 0 | (4,882) | 0
Tax effect | 0 | 1,194 | 0
Reclassification adjustment for net (gains) included in net income, net | 0 | (3,688) | 0
Other comprehensive gain (loss) related to unrealized gains/(losses) on available-for-sale securities, net of taxes | 66,294 | 37,124 | (30,402)
Other comprehensive income (loss), net of tax | 72,303 | 35,079 | (41,606)
Net income | 164,676 | 169,063 | 168,641
Comprehensive income | 236,979 | 204,142 | 127,035
Accumulated Other Comprehensive Income/(Loss) By Component: |  |  |
Unrealized (loss) for pension and other postretirement obligations | (38,267) | (46,175) | (43,497)
Tax effect | 9,394 | 11,293 | 10,660
Net unrealized (loss) for pension and other postretirement obligations | (28,873) | (34,882) | (32,837)
Unrealized gain (loss) on available-for-sale securities | 120,114 | 32,877 | (16,229)
Tax effect | (29,164) | (8,221) | 3,761
Net unrealized gain (loss) on available-for-sale securities | 90,950 | 24,656 | (12,468)
Accumulated other comprehensive income (loss) | $ 62,077 | $ (10,226) | $ (45,305)

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