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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 | $ 593,794 | $ 20,311 | $ 521,503
Other comprehensive (loss) income: |  |  |
Foreign currency translation | (36,279) | 101,148 | (66,996)
Unrealized gains (losses) on investments before income taxes | 698 | (1,794) | 279
Income tax benefit | 443 | 68 | 111
Unrealized gains (losses) on investments, net of tax | 1,141 | (1,726) | 390
Retirement liability adjustment before reclassifications | (6,722) | 7,832 | (6,783)
Amounts reclassified to other expense | 48,792 | 3,948 | 3,263
Retirement liability adjustment before income taxes | 42,070 | 11,780 | (3,520)
Income tax (expense) benefit | (14,836) | (4,989) | 572
Retirement liability adjustment, net of tax | 27,234 | 6,791 | (2,948)
Other comprehensive (loss) income | (7,904) | 106,213 | (69,554)
Comprehensive income | $ 585,890 | $ 126,524 | $ 451,949

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