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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract] |  |  |
NET INCOME | $ 58,840 | $ 103,885 | $ 48,070
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX: |  |  |
Unrealized gain (loss) on available-for-sale securities, net of tax of $74, $7 and $72, respectively | 268 | (12) | (135)
Employee benefit plan: |  |  |
Actuarial loss on retirement plan, net of tax of $1,841, $1,047 and $945, respectively | (6,690) | (1,904) | (1,731)
Plan amendment cost, net of tax of none, $154 and none, respectively |  | (280) |
Amortization of plan amendment cost, prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $457, $754 and $591, respectively | 1,661 | 1,370 | 1,084
Net change for employee benefit plan | (5,029) | (814) | (647)
Change in cumulative foreign currency translation adjustment | (9) | 28 | (65)
TOTAL OTHER COMPREHENSIVE LOSS | (4,770) | (798) | (847)
COMPREHENSIVE INCOME | $ 54,070 | $ 103,087 | $ 47,223

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e557-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 + Details
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