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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 149,156 | $ 12,200
Defined benefit pension plans |  |
Amortization of actuarial (gain) loss, net of tax | (4) | 151
Effects of Settlements, net of tax | 0 | 64
Other comprehensive income (loss), net of tax | (4) | 215
Comprehensive income | $ 149,152 | $ 12,415

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