Accumulated Other Comprehensive Income (AOCI) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 816,066
Ending balance	822,595
Translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(83,203)	$ (122,852)
Other comprehensive income/(loss) before reclassifications, net of tax	(15,955)	(25,747)
Interest expense related to swaps reclassified to the Consolidated Statements of Income, net of tax	0	0
Pension and postretirement liability adjustments reclassified to Consolidated Statements of Income, net of tax	0	0
Net current period other comprehensive income	(15,955)	(25,747)
Ending balance	(99,158)	(148,599)
Pension and postretirement liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(39,661)	(49,994)
Other comprehensive income/(loss) before reclassifications, net of tax	516	792
Interest expense related to swaps reclassified to the Consolidated Statements of Income, net of tax	0	0
Pension and postretirement liability adjustments reclassified to Consolidated Statements of Income, net of tax	(7)	98
Net current period other comprehensive income	509	890
Ending balance	(39,152)	(49,104)
Derivative valuation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,544)	(3,135)
Other comprehensive income/(loss) before reclassifications, net of tax	(343)	(8,011)
Interest expense related to swaps reclassified to the Consolidated Statements of Income, net of tax	1,095	303
Pension and postretirement liability adjustments reclassified to Consolidated Statements of Income, net of tax	0	0
Net current period other comprehensive income	752	(7,708)
Ending balance	(8,792)	(10,843)
Accumulated items of other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(132,408)	(175,981)
Other comprehensive income/(loss) before reclassifications, net of tax	(15,782)	(32,966)
Interest expense related to swaps reclassified to the Consolidated Statements of Income, net of tax	1,095	303
Pension and postretirement liability adjustments reclassified to Consolidated Statements of Income, net of tax	(7)	98
Net current period other comprehensive income	(14,694)	(32,565)
Ending balance	$ (147,102)	$ (208,546)