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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     $ 725,800    
Net income $ 28,034 $ 42,239 107,763 $ 105,278  
Pension and post-retirement plan actuarial gains, net of tax 3,058 2,257 9,250 5,658  
Income attributable to noncontrolling interests (200) (372) (668) (822)  
Preferred dividends (10) (10) (30) (30)  
Cumulative effect of the adoption of ASU 2018-02 780,103   780,103    
Ending Balance 772,465   772,465    
Retained Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 1,058,955 971,453 1,012,266 935,577  
Net income 28,234 42,611 108,431 106,100  
Income attributable to noncontrolling interests (200) (372) (668) (822)  
Common dividends (16,761) (16,270) (49,781) (47,185)  
Preferred dividends (10) (10) (30) (30)  
Ending Balance 1,070,218 997,412 1,070,218 997,412  
Accumulated Other Comprehensive (Loss)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance (225,210) (203,406) (214,003) (218,927)  
Foreign currency translation adjustments 15,520 (16,091) (2,758) (16,115)  
Pension and post-retirement plan actuarial gains, net of tax 3,058 2,257 9,250 5,658  
Unrealized net loss on available-for-sale securities (Note 16) (74) (9) (12) 554  
Reclassification from accumulated other comprehensive loss into net income   (212) 720 15,147  
Income attributable to noncontrolling interests (294) 227 (197) 221  
Ending Balance (207,000) (217,234) (207,000) (217,234)  
Noncontrolling Interests          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 7,144 6,093 6,773 5,637  
Income attributable to noncontrolling interests 494 145 865 601  
Ending Balance $ 7,638 $ 6,238 $ 7,638 $ 6,238  
Cumulative Effect Period of Adoption Adjustment | Retained Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of the adoption of ASU 2018-02         $ 3,772
Cumulative Effect Period of Adoption Adjustment | Accumulated Other Comprehensive (Loss)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of the adoption of ASU 2018-02         $ (3,772)