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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, 2019
Mar. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance $ 633,882  
Net income 23,232 $ 32,371
Foreign currency translation adjustments 15,359 0
Pension and post-retirement plan actuarial gains, net of tax 2,023 2,329
Income attributable to noncontrolling interests (144) (118)
Preferred dividends (10) (10)
Ending Balance 657,361  
Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 935,577 868,675
Net income 23,376 32,489
Income attributable to noncontrolling interests (144) (118)
Common dividends (14,642) (13,380)
Preferred dividends (10) (10)
Reclassification due to the adoption of ASU 2018-02 3,772  
Ending Balance 947,929 887,656
Accumulated Other Comprehensive (Loss)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance (218,927) (171,762)
Foreign currency translation adjustments 361 13,400
Pension and post-retirement plan actuarial gains, net of tax 2,023 2,329
Unrealized net gains on available-for-sale securities (Note 17) 536  
Reclassification from accumulated other comprehensive loss into net income 15,359  
Income attributable to noncontrolling interests (143) (170)
Reclassification due to the adoption of ASU 2018-02 (3,772)  
Ending Balance (204,563) (156,203)
Noncontrolling Interests    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 5,637 4,977
Income attributable to noncontrolling interests 287 288
Ending Balance $ 5,924 $ 5,265