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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 Comprehensive Income [Abstract] |  |  |
Net income | $ 69,984 | $ 27,609 | $ 48,898
Other comprehensive income: |  |  |
Foreign currency translation adjustments, net of $0 tax in 2018, 2017 and 2016 | (236) | 79 | (384)
Unrealized gain (loss) on marketable securities, net of $0 tax in 2018, 2017 and 2016 | 161 | (207) | (123)
Unrealized actuarial gain (loss) on pension benefits, net of tax of ($144), ($194), and $98 in 2018, 2017 and 2016, respectively | 525 | 699 | (352)
Total other comprehensive income (loss) | 450 | 571 | (859)
Total comprehensive income | 70,434 | 28,180 | 48,039
Foreign currency translation adjustment, tax | 0 | 0 | 0
Unrealized gain on marketable securities, tax | 0 | 0 | 0
Unrealized actuarial gain (loss) on pension benefits, tax | $ (144) | $ (198) | $ 98

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