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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Statement of Comprehensive Income [Abstract] |  |
NET INCOME | $ 7,233 | $ 14,200
Other comprehensive income (loss), net of tax: |  |
Foreign currency translation adjustments, net of $0 tax in each of the three months ended March 31, 2019 and 2018 | (22) | (37)
Unrealized gain (loss) on marketable securities, net of $0 tax in each of the three months ended March 31, 2019 and 2018 | 334 | (238)
Amortization of defined benefit pension items, net of tax of $5 and $9 in the three months ended March 31, 2019 and 2018, respectively | 16 | 32
Total other comprehensive income (loss) | 328 | (243)
TOTAL COMPREHENSIVE INCOME | $ 7,561 | $ 13,957

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