CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
PROPERTY, PLANT AND EQUIPMENT (Notes 1, 6 and 9)
Accumulated depreciation of Palo Verde sale leaseback	$ 237,535	$ 233,665
Accumulated amortization on intangible assets	603,637	546,038
Accumulated amortization on nuclear fuel	$ 147,202	$ 146,228
EQUITY
Common stock, par value	$ 0	$ 0
Common stock, authorized shares	150,000,000	150,000,000
Common stock, issued shares	111,392,053	111,095,402
Treasury stock at cost, shares	55,317	115,030
ARIZONA PUBLIC SERVICE COMPANY
PROPERTY, PLANT AND EQUIPMENT (Notes 1, 6 and 9)
Accumulated depreciation of Palo Verde sale leaseback	$ 237,535	$ 233,665
Accumulated amortization on intangible assets	603,637	546,038
Accumulated amortization on nuclear fuel	$ 147,202	$ 146,228