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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
PROPERTY, PLANT AND EQUIPMENT |  |
Accumulated depreciation of Palo Verde sale leaseback | $ 256,884 | $ 253,014
Accumulated amortization on intangible assets | 737,694 | 698,500
Accumulated amortization on nuclear fuel | $ 133,122 | $ 137,207
EQUITY |  |
Common stock, authorized shares (in shares) | 150,000,000 | 150,000,000
Common stock, issued shares (in shares) | 113,014,528 | 112,760,051
Treasury stock at cost, shares (in shares) | 87,608 | 72,006

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