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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 237,841 $ 245,713 $ 188,751
Foreign currency:      
Foreign currency translation continuing operations adjustments, net of tax of $10,977, $24,150, and $24,818, respectively (69,162) (110,671) (105,410)
Foreign currency translation, net of tax (69,162) (110,671) (105,410)
Pension and other postretirement benefits plans:      
Prior service cost recognized in net periodic cost, net of tax of $(20), $0, and $9 respectively 36 0 (12)
Unamortized (loss) gain arising during the period, net of tax of $1,849, $1,469, and $26,624, respectively (3,255) (2,137) (48,245)
Net loss recognized in net periodic cost, net of tax of $(2,489), $(2,242), and $(1,544), respectively 4,476 4,133 2,841
Foreign currency translation, net of tax of $(373), $(316), and $(265), respectively 1,034 861 709
Pension and other postretirement benefits plans adjustment, net of tax 2,291 2,857 (44,707)
Derivatives qualifying as hedges:      
Unrealized gain (loss) on derivatives arising during the period, net of tax $1,359, $379, and $(111), respectively (3,434) (2,974) 594
Reclassification adjustment on derivatives included in net income, net of tax of $(1,010), $(196), and $111, respectively 3,501 483 (594)
Derivatives qualifying as hedges, net of tax 67 (2,491) 0
Other comprehensive (loss) income, net of tax (66,804) (110,305) (150,117)
Comprehensive income 171,037 135,408 38,634
Less: comprehensive income attributable to noncontrolling interest 421 774 995
Comprehensive income attributable to common shareholders $ 170,616 $ 134,634 $ 37,639