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Consolidated Statement of Changes in Retained Earnings and Accumulated Other Comprehensive Loss - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | $ 602,578 |  |
Net income | 125,115 | $ 26,956 | $ 93,862
Pension and post-retirement plan adjustments, net of tax | (17,569) | 20,120 | 1,321
Reclassification from accumulated other comprehensive (loss) into net income | 774 |  | 3,270
Unrecognized net losses on available-for-sale securities (Note 18) | (572) |  |
Income attributable to noncontrolling interests | (660) | (3,694) | (3,578)
Balance at end of period | 639,519 | 602,578 |
Retained Earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | 868,675 | 901,415 | 858,553
Net income | 125,115 | 26,956 | 93,862
Income attributable to noncontrolling interests | (965) | (929) | (1,926)
Common dividends | (57,206) | (52,495) | (49,032)
Preferred dividends | (42) | (42) | (42)
Balance at end of period | 935,577 | 868,675 | 901,415
Accumulated Other Comprehensive (Loss) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | (171,762) | (230,246) | (208,199)
Foreign currency translation adjustments | (30,103) | 41,129 | (24,986)
Pension and post-retirement plan adjustments, net of tax | (17,569) | 20,120 | 1,321
Income attributable to noncontrolling interests | 305 | (2,765) | (1,652)
Balance at end of period | $ (218,927) | (171,762) | $ (230,246)
Accounting Standards Update 2016-16 [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Cumulative effect of the adoption of ASU 2016-16 (Note 1) |  | $ (6,230) |

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