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Consolidated Statement of Changes in Retained Earnings and Accumulated Other Comprehensive Loss Statement - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance     $ 533,809  
Net income $ 23,845 $ 22,495 33,295 $ 36,412
Pension and post-retirement plan adjustments net of tax (Three months June 30 2015 and 2014 $1,477 and $1,629 and six months June 30, 2015 and 2014 $2,894 and $2,434) 2,623 2,882 5,152 4,300
Income attributable to noncontrolling interests 649 (7) 1,139 244
Ending Balance 528,806   528,806  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 833,255 795,051 835,126 792,206
Net income 23,845 22,495 33,295 36,412
Income attributable to noncontrolling interests 453 (7) 685 102
Common dividends (11,959) (11,310) (23,502) (22,481)
Preferred dividends (10) (10) (20) (20)
Ending Balance 845,584 806,219 845,584 806,219
Accumulated Other Comprehensive (Loss)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (187,993) (77,667) (166,730) (78,269)
Foreign currency translation adjustments 3,891 54 (20,159) (904)
Pension and post-retirement plan adjustments net of tax (Three months June 30 2015 and 2014 $1,477 and $1,629 and six months June 30, 2015 and 2014 $2,894 and $2,434) 2,623 2,882 5,152 4,300
Income attributable to noncontrolling interests 196 0 454 142
Ending Balance $ (181,283) $ (74,731) $ (181,283) $ (74,731)