Other Income and Other Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other income:
Interest income	$ 6,406	$ 1,691	$ 12,432	$ 3,333
Miscellaneous	0	(9)	51	53
Total other income	6,406	1,682	12,483	3,386
Other expense:
Non-operating costs	(3,355)	(3,701)	(5,996)	(6,154)
Investment losses — net	(434)	(575)	(1,495)	(1,256)
Miscellaneous	(1,024)	(308)	(1,453)	(596)
Total other expense	(4,813)	(4,584)	(8,944)	(8,006)
APS
Other income:
Interest income	5,691	1,396	10,716	2,495
Miscellaneous	0	0	51	53
Total other income	5,691	1,396	10,767	2,548
Other expense:
Non-operating costs	(3,111)	(2,477)	(5,299)	(4,038)
Miscellaneous	(1,024)	(309)	(1,453)	(596)
Total other expense	$ (4,135)	$ (2,786)	$ (6,752)	$ (4,634)