Summary of Significant Accounting Policies (Schedule of Changes in AOCI Balances by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 1,158,606	$ 1,283,911	$ 1,441,984
Other comprehensive income (loss) before reclassifications	3,301	4,482	5,912
Amounts reclassified from AOCI	1,453	1,317	1,338
Other comprehensive income	1,540	(1,752)	999
Ending Balance	1,262,662	1,158,606	1,283,911
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(33,988)	(39,787)	(47,037)
Ending Balance	(29,234)	(33,988)	(39,787)
Defined Benefit Pension Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(23,572)	(29,354)	(32,637)
Other comprehensive income (loss) before reclassifications	5	4,566	2,036
Amounts reclassified from AOCI	1,504	1,216	1,247
Ending Balance	(22,063)	(23,572)	(29,354)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(8,657)	(6,893)	(7,241)
Other comprehensive income (loss) before reclassifications	727	(1,764)	348
Amounts reclassified from AOCI	0	0	0
Ending Balance	(7,930)	(8,657)	(6,893)
Unrealized Gain (Loss) in Fair Value of Investments, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(1,759)	(3,540)	(7,159)
Other comprehensive income (loss) before reclassifications	2,569	1,680	3,528
Amounts reclassified from AOCI	(51)	101	91
Ending Balance	759	(1,759)	(3,540)
AOCI Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,483)	(731)	(1,730)
Ending Balance	(943)	(2,483)	(731)
Defined Benefit Pension Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0	0	0
Other comprehensive income	0	0	0
Ending Balance	0	0	0
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,423)	(312)	(799)
Other comprehensive income	1,272	(2,111)	487
Ending Balance	(1,151)	(2,423)	(312)
Unrealized Gain (Loss) in Fair Value of Investments, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(60)	(419)	(931)
Other comprehensive income	268	359	512
Ending Balance	$ 208	$ (60)	$ (419)