Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 408,365	$ 729,686	$ 426,753	$ 749,944
Other comprehensive income (loss)	(1,198)	712	(8,391)	4,245
Amounts reclassified from accumulated other comprehensive income (loss)		8		197
Ending balance	381,729	711,004	381,729	711,004
Accumulated Other Comprehensive (Loss) Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(51,443)	(50,100)	(44,250)	(53,822)
Ending balance	(52,641)	(49,380)	(52,641)	(49,380)
Foreign currency translation adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(51,750)	(50,781)	(44,564)	(54,194)
Other comprehensive income (loss)	(1,196)	712	(8,382)	4,125
Amounts reclassified from accumulated other comprehensive income (loss)		0		0
Ending balance	(52,946)	(50,069)	(52,946)	(50,069)
Defined benefit pension plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	307	700	314	700
Other comprehensive income (loss)	(2)	0	(9)	12
Amounts reclassified from accumulated other comprehensive income (loss)		(11)		(23)
Ending balance	$ 305	689	$ 305	689
Unrealized loss on short-term investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(19)		(328)
Other comprehensive income (loss)		0		108
Amounts reclassified from accumulated other comprehensive income (loss)		19		220
Ending balance		$ 0		$ 0