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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 11,389 | $ 37,050
Defined benefit pension plans |  |
Amortization of actuarial (gain) loss, net of tax of ($11) and $208, respectively | (32) | 613
Other comprehensive income (loss), net of tax | (32) | 613
Comprehensive income | $ 11,357 | $ 37,663

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