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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
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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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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