Investments (Summarized Financial Data of Nonconsolidated Affiliates) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Other current assets	$ 1,241	$ 942
Current assets	1,847,174	1,774,192
Total Assets	7,425,525	6,444,119
Current liabilities	1,166,338	949,646
Total Liabilities	2,999,545	2,665,798
Liabilities and Equity, Total	7,425,525	6,444,119
Noncontrolling Interests	12,086	7,091
Net Income (Loss)	353,327	299,968	$ 327,879
Net income (loss) attributable to the entity	352,075	300,365	327,855
Private Equity Fund Investment [Member]
Schedule of Equity Method Investments [Line Items]
Investments in securities, at estimated fair value	2,039,368	1,500,192
Other current assets	28,590	24,111
Total Assets	2,067,958	1,524,303
Total Liabilities	4,790	7,488
Total partners’ capital	2,063,168	1,516,815
Liabilities and Equity, Total	2,067,958	1,524,303
Net investment loss	(13,324)	(15,301)	(13,691)
Net realized gain on investments	190,368	440	79,443
Net change in unrealized appreciation on investments	1,043,627	525,588	150,641
Increase in net assets from operations	1,220,671	510,727	216,393
Operating Entity Investment [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	203,274	164,526
Noncurrent assets	569,505	566,053
Total Assets	772,779	730,579
Current liabilities	219,220	428,735
Noncurrent liabilities	329,965	264,807
Total Liabilities	549,185	693,542
Noncontrolling Interests	(80,604)	(103,829)
Net sales	358,928	312,194	438,168
Gross profit	146,312	11,217	103,510
Net Income (Loss)	135,241	(206,504)	(125,146)
Net income (loss) attributable to the entity	$ 102,829	$ (148,394)	$ (81,268)