Investments (Summarized Financial Data of Nonconsolidated Affiliates) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Other current assets	$ 1,547	$ 1,241
Current assets	1,708,094	1,847,174
Total Assets	6,582,215	7,425,525
Current liabilities	1,174,007	1,166,338
Total Liabilities	2,807,727	2,999,545
Total Liabilities and Equity	6,582,215	7,425,525
Noncontrolling Interests	21,278	12,086
Net Income (Loss)	70,434	353,327	$ 299,968
Net income (loss) attributable to the entity	67,079	352,075	300,365
Private Equity Fund Investment [Member]
Schedule of Equity Method Investments [Line Items]
Investments in securities, at estimated fair value	1,974,189	2,039,368
Other current assets	19,072	28,590
Total Assets	1,993,261	2,067,958
Total Liabilities	3,945	4,790
Total partners’ capital	1,989,316	2,063,168
Total Liabilities and Equity	1,993,261	2,067,958
Net investment loss	(14,129)	(13,324)	(15,301)
Net realized gain on investments	162,644	190,368	440
Net change in unrealized (depreciation) appreciation on investments	(66,333)	1,043,627	525,588
Increase in net assets from operations	82,182	1,220,671	510,727
Operating Entity Investment [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	174,027	203,274
Noncurrent assets	542,625	569,505
Total Assets	716,652	772,779
Current liabilities	126,365	219,220
Noncurrent liabilities	386,425	329,965
Total Liabilities	512,790	549,185
Noncontrolling Interests	(26,593)	(80,604)
Net sales	459,949	358,928	312,194
Gross profit	196,481	146,312	11,217
Net Income (Loss)	3,206	135,241	(206,504)
Net income (loss) attributable to the entity	$ 5,124	$ 102,829	$ (148,394)