Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Income or Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	$ 1,020,755	$ 933,900
Other comprehensive income (loss) before reclassifications	(25,893)	24,658
Amounts reclassified to earnings	225	2,672
Net other comprehensive income (loss) for period	(25,668)	27,330
Balance, end of period	1,118,895	1,020,755
AOCI, Pension and other postretirement benefit plans, tax	2,125	1,951	$ 2,368
AOCI, cumulative changes in net gain (loss) from cash flow hedges, tax	0	0	$ 282
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	(19,575)	(46,905)
Balance, end of period	(45,243)	(19,575)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	(10,571)	(35,478)
Other comprehensive income (loss) before reclassifications	(25,070)	24,907
Amounts reclassified to earnings	0	0
Net other comprehensive income (loss) for period	(25,070)	24,907
Balance, end of period	(35,641)	(10,571)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	(9,004)	(10,455)
Other comprehensive income (loss) before reclassifications	(823)	1,255
Amounts reclassified to earnings	225	196
Net other comprehensive income (loss) for period	(598)	1,451
Balance, end of period	(9,602)	(9,004)
Derivative Instrument Designated as Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	0	(972)
Other comprehensive income (loss) before reclassifications	0	(1,504)
Amounts reclassified to earnings	0	2,476
Net other comprehensive income (loss) for period	0	972
Balance, end of period	$ 0	$ 0