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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

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