Fair Value Measurements - Change in Our Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of period	$ 17,354	$ 14,286	$ 11,233
Purchase of investments	1,021	350
Reclassification between Level 2 and Level 3 fair value	0
Balance at end of period	28,159	17,354	14,286
Equity Securities
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	10,575	2,007	1,914
Rights
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	(1,971)	(16)	1,211
Convertible Debt Securities
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	1,180	727	(72)
(Level 1) | Investments
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of period	10,154	8,147	6,233
Purchase of investments	0	0
Reclassification between Level 2 and Level 3 fair value	0
Balance at end of period	19,561	10,154	8,147
(Level 1) | Equity Securities
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	9,407	2,007	1,914
(Level 1) | Rights
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	0	0	0
(Level 1) | Convertible Debt Securities
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	0	0	0
(Level 2) | Investments
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of period	0
Purchase of investments	1,000
Reclassification between Level 2 and Level 3 fair value	350
Balance at end of period	1,388	0
(Level 2) | Equity Securities
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	38
(Level 2) | Rights
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	0
(Level 2) | Convertible Debt Securities
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	0
(Level 3) | Investments
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of period	7,200	6,139	5,000
Purchase of investments	21	350
Reclassification between Level 2 and Level 3 fair value	(350)
Balance at end of period	7,210	7,200	6,139
(Level 3) | Equity Securities
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	1,130	0	0
(Level 3) | Rights
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	(1,971)	(16)	1,211
(Level 3) | Convertible Debt Securities
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Unrealized gain (loss)	$ 1,180	$ 727	$ (72)