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Consolidated Statement of Changes in Retained Earnings and Accumulated Other Comprehensive Loss - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | $ 732,573 |  |
Net income | 121,162 | $ 137,649 | $ 125,115
Pension and post-retirement plan adjustments, net of tax | 9,296 | (5,559) | (17,569)
(Income) loss attributable to noncontrolling interests | (1,220) | (1,136) | (660)
Balance at end of period | 809,891 | 732,573 |
Retained Earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | 1,012,266 | 935,577 | 868,675
Net income | 121,162 | 137,649 | 125,115
(Income) loss attributable to noncontrolling interests | (1,061) | (1,209) | (965)
Common dividends | (66,537) | (63,481) | (57,206)
Preferred dividends | (41) | (42) | (42)
Balance at end of period | 1,065,789 | 1,012,266 | 935,577
Retained Earnings | Cumulative effect, period of adoption, adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period |  | 3,772 |
Balance at end of period |  |  | 3,772
Accumulated Other Comprehensive Loss |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | (214,003) | (218,927) | (171,762)
Foreign currency translation adjustments | 22,260 | (1,657) | (30,103)
Pension and post-retirement plan adjustments, net of tax | 9,296 | (5,559) | (17,569)
Unrecognized net gains on available-for-sale securities (Note 18) | (7) | 578 | (572)
Reclassification of currency translation from accumulated other comprehensive (loss) into net income (Note 5) | 216 | 15,261 |
(Income) loss attributable to noncontrolling interests | (159) | 73 | 305
Balance at end of period | (182,397) | (214,003) | (218,927)
Accumulated Other Comprehensive Loss | Cumulative effect, period of adoption, adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period |  | (3,772) |
Balance at end of period |  |  | (3,772)
Noncontrolling Interests |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance at beginning of period | 6,773 | 5,637 | 4,977
(Income) loss attributable to noncontrolling interests | 1,220 | 1,136 | 660
Balance at end of period | $ 7,993 | $ 6,773 | $ 5,637

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