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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     $ 725,800    
Net income $ 36,066 $ 39,806 79,741 $ 63,038  
Pension and post-retirement plan actuarial gains, net of tax 3,090 1,378 6,192 3,401  
Income attributable to noncontrolling interests (340) (306) (468) (450)  
Preferred dividends (10) (10) (20) (20)  
Cumulative effect of the adoption of ASU 2018-02 748,654   748,654    
Ending Balance 741,510   741,510    
Retained Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 1,039,609 947,929 1,012,266 935,577  
Net income 36,406 40,112 80,209 63,488  
Income attributable to noncontrolling interests (340) (306) (468) (450)  
Common dividends (16,710) (16,272) (33,032) (30,914)  
Preferred dividends (10) (10) (20) (20)  
Ending Balance 1,058,955 971,453 1,058,955 971,453  
Accumulated Other Comprehensive (Loss)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance (233,075) (204,563) (214,003) (218,927)  
Foreign currency translation adjustments 4,669 (385) (18,278) (24)  
Pension and post-retirement plan actuarial gains, net of tax 3,090 1,378 6,192 3,401  
Unrealized net gain on available-for-sale securities (Note 16) 124 27 62 563  
Reclassification from accumulated other comprehensive loss into net income 0   720 15,359  
Income attributable to noncontrolling interests (18) 137 97 (6)  
Ending Balance (225,210) (203,406) (225,210) (203,406)  
Noncontrolling Interests          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 6,786 5,924 6,773 5,637  
Income attributable to noncontrolling interests 358 169 371 456  
Ending Balance $ 7,144 $ 6,093 $ 7,144 $ 6,093  
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)