CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
PROPERTY, PLANT AND EQUIPMENT
Accumulated depreciation of Palo Verde sale leaseback	$ 245,275	$ 241,405
Accumulated amortization on intangible assets	591,202	582,272
Accumulated amortization on nuclear fuel	$ 137,850	$ 144,070
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)	112,159,896	111,816,170
Treasury stock at cost, shares (in shares)	58,135	64,463
ARIZONA PUBLIC SERVICE COMPANY
PROPERTY, PLANT AND EQUIPMENT
Accumulated depreciation of Palo Verde sale leaseback	$ 245,275	$ 241,405
Accumulated amortization on intangible assets	590,069	581,135
Accumulated amortization on nuclear fuel	$ 137,850	$ 144,070