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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 505,868 | $ 404,389 | $ 333,817
Other comprehensive (loss) gain, net of tax: |  |  |
Foreign currency translation adjustments | (12,065) | 17,597 | (12,131)
Unrealized holding (loss) gain on investments: |  |  |
Unrealized holding (losses) gains during the period, net of income taxes of $285, $1 and $457 | (1,088) | 190 | (918)
Less: reclassification adjustment for losses realized in net income, net of income taxes of $(96), $(99) and $(201) | 61 | 260 | 384
Total other comprehensive (loss) gain, net of taxes | (13,092) | 18,047 | (12,665)
Comprehensive income | $ 492,776 | $ 422,436 | $ 321,152

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