Other Income and Other Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other income:
Interest income	$ 477	$ 117
Miscellaneous	3	0
Total other income	480	117
Other expense:
Non-operating costs	(1,959)	(2,049)
Investment losses — net	(301)	(518)
Miscellaneous	(1,420)	(1,471)
Total other expense	(3,680)	(4,038)
Arizona Public Service Company
Other income:
Interest income	338	73
Gain on disposition of property	308	332
Miscellaneous	416	205
Total other income	1,062	610
Other expense:
Non-operating costs	(2,166)	(1,966)
Loss on disposition of property	(88)	(426)
Miscellaneous	(2,124)	(2,358)
Total other expense	$ (4,378)	$ (4,750)