Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period			$ 1,172,466
Other comprehensive income (loss) before reclassifications			(3,860)	$ (80,398)
Amounts reclassified from accumulated other comprehensive loss			280	260
Other comprehensive income (loss)	$ (17,813)	$ (34,948)	(3,580)	(80,138)
Balance, end of period	1,210,612	1,089,853	1,210,612	1,089,853
AOCI, Pension and other postretirement benefit plans, tax	1,846	2,056	1,846	2,056	$ 1,926	$ 2,125
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	(71,031)	(90,433)	(85,264)	(45,243)
Other comprehensive income (loss)	(17,813)	(34,948)	(3,580)	(80,138)
Balance, end of period	(88,844)	(125,381)	(88,844)	(125,381)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period			(75,575)	(35,641)
Other comprehensive income (loss) before reclassifications			(3,860)	(80,383)
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive income (loss)			(3,860)	(80,383)
Balance, end of period	(79,435)	(116,024)	(79,435)	(116,024)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period			(9,689)	(9,602)
Other comprehensive income (loss) before reclassifications			0	(15)
Amounts reclassified from accumulated other comprehensive loss			280	260
Other comprehensive income (loss)			280	245
Balance, end of period	$ (9,409)	$ (9,357)	$ (9,409)	$ (9,357)