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Significant Accounting Policies - Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Dividends Payable [Line Items] |  |  |
SUMMIT Operator tax expense | $ 9,201 | $ 2,647 | $ 1,000
Federal, state and local tax provision | $ 8,200 | $ 3,700 | $ 2,800
Dividends per share paid (in dollars per share) | $ 3.25 | $ 6.17 | $ 8.09
Ordinary Income Dividend |  |  |
Dividends Payable [Line Items] |  |  |
Dividends per share paid (in dollars per share) | 0.00 | 2.56 | 0.50
Capital Gains Dividend |  |  |
Dividends Payable [Line Items] |  |  |
Dividends per share paid (in dollars per share) | $ 3.25 | $ 1.17 | $ 5.92

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