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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 91,699 | $ 103,192 | $ 543,411 | $ 148,978
Defined benefit pension plans |  |  |  |
Amortization of actuarial (gain) loss, net of tax | (3) | 151 | (10) | 452
Effects of Settlements, net of tax | 0 | 0 | 0 | 64
Other comprehensive income (loss), net of tax | (3) | 151 | (10) | 516
Comprehensive income | $ 91,696 | $ 103,343 | $ 543,401 | $ 149,494

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