Summary of Significant Accounting Policies (Details) - Schedule of fair value measurement of level 3 financial assets and liabilities - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Equity securities [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at Beginning of Period	$ 109,251	$ 24,577
Fair Value Adjustments	(11,314)	715
Relating to Undistributed Earnings		1,424
Purchases, Sales and Settlements	4,984	24,215
Transfer in and/or out of Level 3	(672)
Balance at End of Period	102,249	50,931
Loans receivable at fair value [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at Beginning of Period	43,338	33,731
Fair Value Adjustments	(21,834)	11,648
Relating to Undistributed Earnings	3,134	1,621
Purchases, Sales and Settlements	93,853	(11,489)
Transfer in and/or out of Level 3	225,848
Balance at End of Period	344,339	35,511
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at Beginning of Period	4,616	4,633
Fair Value Adjustments
Relating to Undistributed Earnings	(154)	(238)
Purchases, Sales and Settlements
Transfer in and/or out of Level 3
Balance at End of Period	$ 4,462	$ 4,395