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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance     $ 633,882  
Net income $ 39,806 $ 33,179 63,038 $ 65,550
Pension and post-retirement plan actuarial gains, net of tax 1,378 3,059 3,401 5,388
Income attributable to noncontrolling interests (306) (242) (450) (360)
Preferred dividends (10) (10) (20) (20)
Ending Balance 685,054   685,054  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 947,929 887,656 935,577 868,675
Net income 40,112 33,421 63,488 65,910
Income attributable to noncontrolling interests (306) (242) (450) (360)
Common dividends (16,272) (14,581) (30,914) (27,961)
Preferred dividends (10) (10) (20) (20)
Reclassification due to the adoption of ASU 2018-02 3,772   3,772  
Ending Balance 971,453 906,244 971,453 906,244
Accumulated Other Comprehensive (Loss)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (204,563) (156,203) (218,927) (171,762)
Foreign currency translation adjustments (385) (27,880) (24) (14,480)
Pension and post-retirement plan actuarial gains, net of tax 1,378 3,059 3,401 5,388
Unrealized net gains on available-for-sale securities (Note 17) 27   563  
Reclassification from accumulated other comprehensive loss into net income   (774) 15,359 (774)
Income attributable to noncontrolling interests 137 273 (6) 103
Reclassification due to the adoption of ASU 2018-02 (3,772)   (3,772)  
Ending Balance (203,406) (181,525) (203,406) (181,525)
Noncontrolling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 5,924 5,265 5,637 4,977
Income attributable to noncontrolling interests 169 (31) 456 257
Ending Balance $ 6,093 $ 5,234 $ 6,093 $ 5,234