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Basis of Presentation (Other Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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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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