Accumulated Other Comprehensive Income (AOCI) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 819,865	$ 702,689	$ 608,280
Ending balance	877,605	819,865	702,689
Translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(83,203)	(122,852)	(115,976)
Other comprehensive income/(loss) before reclassifications	(22,677)	39,649	(6,876)
Pension/postretirement settlements and curtailments, net of tax	0	0	0
Pension/postretirement plan remeasurement, net of tax	0	0	0
Interest expense related to swaps reclassified to the Statements of Income, net of tax	0	0	0
Pension and postretirement liability adjustments reclassified to Statements of Income, net of tax	0	0	0
Adjustment related to prior period change in opening valuation allowance			0
Net current period other comprehensive income	(22,677)	39,649	(6,876)
Ending balance	(105,880)	(83,203)	(122,852)
Pension and postretirement liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(39,661)	(49,994)	(47,109)
Other comprehensive income/(loss) before reclassifications	1,869	(722)	(525)
Pension/postretirement settlements and curtailments, net of tax	0	283	376
Pension/postretirement plan remeasurement, net of tax	(796)	10,390	(1,437)
Interest expense related to swaps reclassified to the Statements of Income, net of tax	0	0	0
Pension and postretirement liability adjustments reclassified to Statements of Income, net of tax	98	382	47
Adjustment related to prior period change in opening valuation allowance			(1,346)
Net current period other comprehensive income	1,171	10,333	(2,885)
Ending balance	(38,490)	(39,661)	(49,994)
Derivative valuation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,544)	(3,135)	4,697
Other comprehensive income/(loss) before reclassifications	2,812	(9,363)	(10,523)
Pension/postretirement settlements and curtailments, net of tax	0	0	0
Pension/postretirement plan remeasurement, net of tax	0	0	0
Interest expense related to swaps reclassified to the Statements of Income, net of tax	5,118	2,954	2,691
Pension and postretirement liability adjustments reclassified to Statements of Income, net of tax	0	0	0
Adjustment related to prior period change in opening valuation allowance			0
Net current period other comprehensive income	7,930	(6,409)	(7,832)
Ending balance	(1,614)	(9,544)	(3,135)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(132,408)	(175,981)	(158,388)
Other comprehensive income/(loss) before reclassifications	(17,996)	29,564	(17,924)
Pension/postretirement settlements and curtailments, net of tax	0	283	376
Pension/postretirement plan remeasurement, net of tax	(796)	10,390	(1,437)
Interest expense related to swaps reclassified to the Statements of Income, net of tax	5,118	2,954	2,691
Pension and postretirement liability adjustments reclassified to Statements of Income, net of tax	98	382	47
Adjustment related to prior period change in opening valuation allowance			(1,346)
Net current period other comprehensive income	(13,576)	43,573	(17,593)
Ending balance	$ (145,984)	$ (132,408)	$ (175,981)