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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract] |  |
NET INCOME | $ 10,365 | $ 1,949
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX: |  |
Unrealized loss on available-for-sale securities, net of tax of $8 and $82, respectively | (15) | (151)
Employee benefit plan: |  |
Actuarial gain (loss), net of tax of none and $469, respectively |  | (834)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $163 and $159, respectively | 299 | 282
Net change for employee benefit plan | 299 | (552)
Change in cumulative foreign currency translation adjustment | 30 |
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) | 314 | (703)
COMPREHENSIVE INCOME | $ 10,679 | $ 1,246

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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