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Condensed Consolidated Statement of Changes in Retained Earnings, Accumulated Other Comprehensive Loss and Noncontrolling Interests - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance $ 801,898  
Net income 36,414 $ 43,674
Pension and post-retirement plan actuarial gains, net of tax 3,712 3,102
Income attributable to noncontrolling interests (186) (128)
Preferred dividends (10) (10)
Cumulative effect of the adoption of ASU 2018-02 822,890  
Ending Balance 814,676  
Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 1,065,789 1,012,266
Net income 36,600 43,802
Income attributable to noncontrolling interests (186) (128)
Common dividends (16,810) (16,321)
Preferred dividends (10) (10)
Ending Balance 1,085,383 1,039,609
Accumulated Other Comprehensive (Loss)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance (182,397) (214,003)
Foreign currency translation adjustments (10,223) (22,947)
Pension and post-retirement plan actuarial gains, net of tax 3,712 3,102
Unrealized net losses on available-for-sale securities (Note 16) (5) (62)
Reclassification from accumulated other comprehensive loss into net income   720
Income attributable to noncontrolling interests (35) 115
Ending Balance (188,948) (233,075)
Noncontrolling Interests    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 7,993 6,773
Income attributable to noncontrolling interests 221 13
Ending Balance $ 8,214 $ 6,786