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Significant Accounting Policies - Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Dividends Payable [Line Items] |  |  |
SUMMIT Operator tax expense | $ 730 | $ 9,201 | $ 2,647
Federal, state and local tax provision | $ 700 | $ 9,200 | $ 2,600
Dividends per share paid (in dollars per share) | $ 3.16 | $ 3.25 | $ 6.17
Internal Revenue Service (IRS) |  |  |
Dividends Payable [Line Items] |  |  |
SUMMIT Operator tax expense | $ 4,900 | $ 8,200 | $ 3,700
O 2024 A Dividends |  |  |
Dividends Payable [Line Items] |  |  |
Dividends per share paid (in dollars per share) | $ 0.23 |  |
O 2023 A Dividends |  |  |
Dividends Payable [Line Items] |  |  |
Dividends per share paid (in dollars per share) |  | $ 0.00 |
O 2022 A Dividends |  |  |
Dividends Payable [Line Items] |  |  |
Dividends per share paid (in dollars per share) |  |  | $ 2.56
Capital Gains 2024 Dividend |  |  |
Dividends Payable [Line Items] |  |  |
Dividends per share paid (in dollars per share) | $ 2.93 |  |
Capital Gains 2023 Dividend |  |  |
Dividends Payable [Line Items] |  |  |
Dividends per share paid (in dollars per share) |  | $ 3.25 |
Capital Gains 2022 Dividend |  |  |
Dividends Payable [Line Items] |  |  |
Dividends per share paid (in dollars per share) |  |  | $ 1.17

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