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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Funds held for customers, securities carried at fair value | $ 25,391 | $ 28,462
Accumulated depreciation | 365,187 | 360,907
Accumulated amortization | $ 610,707 | $ 587,273
Common stock, par value (per share) | $ 1 | $ 1
Common stock, shares authorized | 500,000 | 500,000
Common stock, shares outstanding | 42,104 | 41,973

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