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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

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