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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net (loss) income | $ (27,581) | $ 48,539 | $ 89,023 | $ 17,941
Postretirement benefits: |  |  |  |
Amortization of prior service cost | 92 | 91 | 276 | 276
Amortization of actuarial gain | (12) |  | (37) |
Income tax expense | (20) | (22) | (59) | (68)
Total comprehensive (loss) income | $ (27,521) | $ 48,608 | $ 89,203 | $ 18,149

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