Capital Stock (Details) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
	Jan. 07, 2021 $ / shares shares	Mar. 31, 2024 USD ($) director classOfCommonShare	Mar. 31, 2023 USD ($)
Class of Stock [Line Items]
Classes of common shares | classOfCommonShare		2
Minimum number of directors up for election to entitle shareholders to vote | director		3
Percentage of directors up for election if more than minimum number		33.33%
Preferred stock dividends		$ 0	$ 12,000
Undeclared cumulative dividends		13,500
Redemption value of preferred stock		$ 644,000
Preferred stock | Berkshire Hathaway | ION Media
Class of Stock [Line Items]
Preferred shares issued (in shares) | shares	6
Face value of preferred shares (in dollars per share) | $ / shares	$ 100,000
Preferred shares redemption price, as a percent	105.00%
Preferred stock dividend rate	8.00%
Preferred stock dividend rate if dividends not paid in cash	9.00%
Preferred stock dividends			$ 12,000
Common stock, Class A | Berkshire Hathaway
Class of Stock [Line Items]
Number of shares purchasable by warrant (up to) (in shares) | shares	23,100
Exercise right of warrants (in dollars per share) | $ / shares	$ 13