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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net income | $ 17,643 | $ 90,908 | $ 105,931
Other comprehensive gain (loss), net of applicable taxes: |  |  |
Foreign currency translation adjustment | 4,805 | (3,347) | (3,018)
Less: reclassification adjustment for translation gain included in other income | 0 | 0 | 280
Foreign currency translation adjustment, net | 4,805 | (3,347) | (2,738)
Unrealized (loss) gain on short-term investments | (30) | 12 | (27)
Total other comprehensive gain (loss) | 4,775 | (3,335) | (2,765)
Comprehensive income | $ 22,418 | $ 87,573 | $ 103,166

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