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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Statement of Financial Position [Abstract] |  |
Cash and cash equivalents, securities carried at fair value |  | $ 22,000
Accumulated depreciation | $ 340,233 | 334,101
Accumulated amortization | $ 743,140 | $ 775,190
Common stock, par value (per share) | $ 1 | $ 1
Common stock, shares authorized | 500,000 | 500,000
Common stock, shares outstanding | 44,046 | 43,743

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