Accumulated Other Comprehensive Income (AOCI) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 816,066
Ending balance	864,217
Translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(83,203)	$ (122,852)
Other comprehensive income/(loss) before reclassifications, net of tax	(2,181)	(16,783)
Pension/postretirement curtailment loss, net of tax		0
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	(2,181)	(16,783)
Ending balance	(85,384)	(139,635)
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	393	581
Pension/postretirement curtailment loss, net of tax		265
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	(14)	186
Net current period other comprehensive income	379	1,032
Ending balance	(39,282)	(48,962)
Derivative adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,544)	(3,135)
Other comprehensive income/(loss) before reclassifications, net of tax	(262)	(9,028)
Pension/postretirement curtailment loss, net of tax		0
Interest expense related to swaps reclassified to the Consolidated Statements of Income, net of tax	2,408	1,133
Pension and postretirement liability adjustments reclassified to Consolidated Statements of Income, net of tax	0	0
Net current period other comprehensive income	2,146	(7,895)
Ending balance	(7,398)	(11,030)
Accumulated 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	(2,050)	(25,230)
Pension/postretirement curtailment loss, net of tax		265
Interest expense related to swaps reclassified to the Consolidated Statements of Income, net of tax	2,408	1,133
Pension and postretirement liability adjustments reclassified to Consolidated Statements of Income, net of tax	(14)	186
Net current period other comprehensive income	344	(23,646)
Ending balance	$ (132,064)	$ (199,627)