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Loans Receivable - Narrative (Details) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 GBP (£)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest	$ 26,659	$ 15,615
Non-real estate loans	375,060	455,508
Allowance for credit loss	151,433	215,239
Real estate loans receivable, net of credit allowance	1,068,681	443,372
Provision for loan losses	7,270	94,436	$ 18,690
Real Estate Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Real estate loans receivable, net of credit allowance	1,292,308
Provision for loan losses	166,785
Safanad
Financing Receivable, Troubled Debt Restructuring [Line Items]
Real estate loans receivable, net of credit allowance	$ 750,330			£ 540,000
Working capital facility \| £				£ 30,000
Term of receivable	5 years
Non-real estate loans receivable
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-real estate loans		86,411
Allowance for credit loss		42,376
Provision for loan losses		$ 88,201