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CONSOLIDATED STATEMENTS OF COMPREHENSIVE 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 INCOME | $ 36,962 | $ 22,818 | $ 111,876 | $ 39,591
OTHER COMPREHENSIVE INCOME, NET OF TAX: |  |  |  |
Unrealized gain on available-for-sale securities, net of tax of $7, $12, $49 and $60, respectively | 27 | 43 | 178 | 214
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $175, $117, $525 and $351, respectively | 634 | 422 | 1,903 | 1,266
Change in cumulative foreign currency translation adjustment | 25 | (8) | 34 | (10)
TOTAL OTHER COMPREHENSIVE INCOME | 686 | 457 | 2,115 | 1,470
COMPREHENSIVE INCOME | $ 37,648 | $ 23,275 | $ 113,991 | $ 41,061

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