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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Statement of Financial Position [Abstract] |  |
Accumulated depreciation | $ 360,458 | $ 354,832
Accumulated amortization | $ 645,057 | $ 616,817
Common stock, par value (per share) | $ 1 | $ 1
Common stock, shares authorized | 500,000 | 500,000
Common stock, shares outstanding | 44,740 | 44,315

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