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Basis of Presentation (Other Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
SPC dividends payable	$ 64,472	$ 68,865
Unpaid shareholder dividends	2,700	2,694	$ 2,694
Deferred compensation liabilities	51,456	30,334
Contingent consideration	24,000	0	$ 0
All other	136,648	80,146
Total other liabilities	$ 279,276	$ 182,039

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