Other Income and Other Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other income:
Interest income	$ 387	$ 184	$ 864	$ 302
Investment gains — net	0	13	0	13
Miscellaneous	97	0	100	(1)
Total other income	484	197	964	314
Other expense:
Non-operating costs	(3,401)	(2,085)	(5,360)	(4,133)
Investment losses — net	(227)	(539)	(528)	(1,058)
Miscellaneous	(194)	(218)	(1,614)	(1,689)
Total other expense	(3,822)	(2,842)	(7,502)	(6,880)
Arizona Public Service Company
Other income:
Interest income	257	109	596	181
Gain on disposition of property	260	4,989	567	5,321
Miscellaneous	625	649	1,041	855
Total other income	1,142	5,747	2,204	6,357
Other expense:
Non-operating costs	(3,753)	(2,719)	(5,918)	(4,685)
Loss on disposition of property	(1,169)	(657)	(1,257)	(1,083)
Miscellaneous	(729)	(1,054)	(2,854)	(3,412)
Total other expense	$ (5,651)	$ (4,430)	$ (10,029)	$ (9,180)