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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net Income | $ 82,957 | $ 38,254 | $ 52,182
Defined benefit pension plans |  |  |
Actuarial gain, net of tax of $1,792, $3,703, 3,235 and respectively | 5,275 | 5,919 | 5,171
Amortization of actuarial loss, net of tax of $651, $957, and $1,880, respectively | 1,035 | 1,527 | 3,004
Effects of settlements, net of tax of $0, $1,598, and $193, respectively | 0 | 2,557 | 308
Other comprehensive income, net of tax | 6,310 | 10,003 | 8,483
Comprehensive income | $ 89,267 | $ 48,257 | $ 60,665

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