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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 31,661 | $ 9,981 | $ 63,835 | $ 34,159
Defined benefit pension plans |  |  |  |
Amortization of actuarial loss, net of tax of $170, $225, $479 and $593, respectively | 271 | 359 | 766 | 947
Effect of settlements, net of tax of $-, $-, $- and $114, respectively | 0 | 0 | 0 | 183
Other comprehensive income, net of tax | 271 | 359 | 766 | 1,130
Comprehensive income | $ 31,932 | $ 10,340 | $ 64,601 | $ 35,289

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