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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parentheticals) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Funds held for customers, securities carried at fair value $ 13,302 $ 28,462
Accumulated depreciation 346,364 360,907
Accumulated amortization $ 675,417 $ 587,273
Common stock, par value (per share) $ 1 $ 1
Common stock, shares authorized 500,000 500,000
Common stock, shares outstanding 42,601 41,973