Other Income and Other Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other income:
Interest income	$ 8,647	$ 3,497	$ 884
Debt return on Four Corners SCR deferral (Note 3)	16,153	354	0
Miscellaneous	96	155	17
Total other income	24,896	4,006	901
Other expense:
Non-operating costs	(10,076)	(11,749)	(9,235)
Investment losses — net	(417)	(4,113)	(1,747)
Miscellaneous	(7,473)	(5,677)	(4,355)
Total other expense	(17,966)	(21,539)	(15,337)
ARIZONA PUBLIC SERVICE COMPANY
Other income:
Interest income	6,496	2,504	261
Debt return on Four Corners SCR deferral (Note 3)	16,153	354	0
Miscellaneous	97	155	10
Total other income	22,746	3,013	271
Other expense:
Non-operating costs	(9,462)	(10,825)	(8,455)
Miscellaneous	(5,830)	(3,088)	(2,099)
Total other expense	$ (15,292)	$ (13,913)	$ (10,554)