CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
PROPERTY, PLANT AND EQUIPMENT
Accumulated depreciation of Palo Verde sale leaseback	$ 249,144	$ 245,275
Accumulated amortization on intangible assets	647,276	591,202
Accumulated amortization on nuclear fuel	$ 137,330	$ 137,850
EQUITY
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, authorized shares (in shares)	150,000,000	150,000,000
Common stock, issued shares (in shares)	112,540,126	112,159,896
Treasury stock at cost, shares (in shares)	103,546	58,135
ARIZONA PUBLIC SERVICE COMPANY
PROPERTY, PLANT AND EQUIPMENT
Accumulated depreciation of Palo Verde sale leaseback	$ 249,144	$ 245,275
Accumulated amortization on intangible assets	646,142	590,069
Accumulated amortization on nuclear fuel	$ 137,330	$ 137,850