Loans and Investments - Purchased Credit Deterioration and Troubled Debt Restructurings (Details) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) loan	Jun. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) loan item	Sep. 30, 2021 USD ($) item	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Purchase of loan					$ 5,418,113	$ 5,174,313
Allowance for credit losses	$ 138,447	$ 122,296	$ 121,331	$ 131,534	$ 122,296	$ 131,534	$ 113,241	$ 148,329
Proceeds from full satisfaction of loans	95,000
Reversal of allowance for credit losses	7,500
Interest income from loans	3,500
Troubled debt restructurings, number | item					2
Other loans modification | item					0	0
Interest reserve					$ 123,900		$ 87,400
Number of loans covered under interest reserve | loan		463			463		328
Aggregate UPB covered under interest reserve		$ 7,730,000			$ 7,730,000		$ 5,750,000
Impairment loss on sale of loans		14,360		16,334	32,526	$ 86,102
Hotel Portfolio
Financing Receivable, Recorded Investment, Past Due [Line Items]
Allowance for credit losses	$ 225	18	16	16	18	16	8	7,759
Hotel Portfolio | Forbearance agreement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Fixed rate of interest (as a percent)	9.50%
Principal reduction									$ (10,000)
Pay rate (as a percent)									1.00%
Hotel Portfolio | Forbearance agreement | LIBOR
Financing Receivable, Recorded Investment, Past Due [Line Items]
Variable rate, spread (as a percent)									3.00%
LIBOR floor rate									1.50%
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Allowance for credit losses	$ 13,819	$ 5,819	5,819	$ 13,819	5,819	$ 13,819	5,819	$ 13,861
Retail | Loan modification agreement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Maturity period (in years)								3 years
Percentage of interest foregone								2.00
Principal paydowns								$ 6,000
Principal reduction								(8,000)
Additional reserve deposit								$ 4,600
Retail | Loan modification agreement | LIBOR
Financing Receivable, Recorded Investment, Past Due [Line Items]
Variable rate, spread (as a percent)								5.50%
LIBOR floor rate								6.50%
Bridge loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans sold | loan		4
Unpaid principal balance on loans		$ 296,900			296,900
Impairment loss on sale of loans		2,000
Bridge loans | Hotel Portfolio
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal amount									$ 110,000
Purchase of loan								$ 60,000	50,000
Allowance for credit losses								7,500
Loan discount								39,900
Total discount received									$ 20,100
Bridge loans | Retail | Loan modification agreement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal amount								$ 26,500
Bridge loans | Retail | Loan modification agreement | LIBOR
Financing Receivable, Recorded Investment, Past Due [Line Items]
Variable rate, spread (as a percent)								6.00%
LIBOR floor rate								2.375%
Mezzanine loans | Retail | Loan modification agreement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal amount								$ 6,100
Fixed rate of interest (as a percent)								12.00%
Bridge loan and mezzanine loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan discount			102,200
Total mortgage loans and mezzanine loan sold			110,500
Capital investment used to be future			66,300
Fees and expenses			9,200
Additional potential loan recover			$ 2,800
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due 90 days or more still accruing interest		$ 0			$ 0		$ 0