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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |  |  |
Net Income | [1] | $ 103,101 | $ 111,105 | [2],[3] | $ 100,743 | [3]
Other Comprehensive Income (Loss): |  |  |  |  |  |
Foreign currency translation adjustments (Note 20) |  | 4,425 | (37,966) |  | 26,293 |
Defined benefit pension plans: |  |  |  |  |  |
Net actuarial gain (loss) arising in period (net of taxes of $1,263, $2,300 and $771 for 2019, 2018 and 2017, respectively) |  | 4,112 | (7,080) |  | (582) |
Amortization of prior service cost included in pension expense (net of taxes of $3, $3 and $4 for 2019, 2018 and 2017, respectively) |  | 9 | 10 |  | 10 |
Amortization of actuarial loss included in pension expense (net of taxes of $657, $979 and $1,240 for 2019, 2018 and 2017, respectively) |  | 2,082 | 3,080 |  | 2,269 |
Net defined benefit pension plan activity (Note 20) |  | 6,203 | (3,990) |  | 1,697 |
Cash flow hedges: |  |  |  |  |  |
Reclassifications to income in period |  | (9) | (10) |  | (9) |
Net cash flow hedge activity (Note 20) |  | (9) | (10) |  | (9) |
Other Comprehensive Income (Loss) |  | 10,619 | (41,966) |  | 27,981 |
Comprehensive Income | [1] | 113,720 | 69,139 |  | 128,724 |
Comprehensive (Income) Loss Attributable to Noncontrolling Interests |  | 47 | 58 |  | (48) |
Comprehensive Income Attributable to Stepan Company | [1] | $ 113,767 | $ 69,197 |  | $ 128,676 |
[1] | The 2018 and 2017 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.
[2] | The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO
[3] | The retained earnings and net income amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.

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