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Condensed Consolidated Statement of Changes in Retained Earnings, Accumulated Other Comprehensive Loss and Noncontrolling Interests (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement of Stockholders' Equity [Abstract] |  |  |  |
Tax on pension and post-retirement plan adjustments | $ 468 | $ 886 | $ 2,518 | $ 2,566
Preferred stock, dividends (in dollars per share) | $ 0.5625 | $ 0.5625 | $ 0.5625 | $ 0.5625

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