Other Income and Other Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other income:
Interest income	$ 65	$ 127	$ 370	$ 422
Investment gains — net	0	0	13	0
Miscellaneous	6	12	2	127
Total other income	71	139	385	549
Other expense:
Non-operating costs	(2,502)	(2,328)	(6,636)	(6,529)
Investment losses — net	(450)	(563)	(1,508)	(1,708)
Miscellaneous	(2,253)	(2,647)	(3,941)	(4,196)
Total other expense	(5,205)	(5,538)	(12,085)	(12,433)
Arizona Public Service Company
Other income:
Interest income	0	32	181	105
Gain on disposition of property	183	(58)	5,504	627
Miscellaneous	384	676	1,239	1,267
Total other income	567	650	6,924	1,999
Other expense:
Non-operating costs	(2,714)	(2,248)	(7,398)	(6,643)
Loss on disposition of property	36	(327)	(1,048)	(934)
Miscellaneous	(1,098)	(1,390)	(4,510)	(4,191)
Total other expense	$ (3,776)	$ (3,965)	$ (12,956)	$ (11,768)