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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

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