Schedule IV - Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconcile mortgage loans on real estate
Balance at beginning	$ 4,363,719	$ 4,246,694	$ 2,529,624
CECL Day 1 adjustment		(7,527)
Origination of loan receivables	9,182,588	5,776,586	3,928,467
Purchases of loan receivables	217,329	277,170	748,151
Proceeds from disposition and principal payment of loan receivables	(6,452,235)	(6,115,265)	(3,455,223)
Loans acquired as part of merger transactions	102,798		130,449
Net realized gain (loss) on sale of loan receivables	147,484	213,740	70,574
Net unrealized gain (loss) on loan receivables	(2,853)	4,502	1,049
Accretion/amortization of discount, premium and other fees	13,232	8,434	14,194
Loans consolidated as part of RCLT 2019-2 transaction			463,177
Foreign currency gain (loss), net	4,091	4,509
Payment of guaranteed loan financing			(177,815)
Transfers to real estate owned, held for sale	(9,015)	(11,339)	(2,269)
Provision for loan losses	(8,727)	(33,785)	(3,684)
Balance at Ending	7,550,229	4,363,719	4,246,694
Loans, net
Reconcile mortgage loans on real estate
Balance at beginning	4,023,431	4,054,183	2,414,366
CECL Day 1 adjustment		(7,527)
Origination of loan receivables	3,826,182	699,650	1,307,143
Purchases of loan receivables	141,663	277,170	739,002
Proceeds from disposition and principal payment of loan receivables	(977,096)	(962,404)	(826,702)
Loans acquired as part of merger transactions			130,449
Net realized gain (loss) on sale of loan receivables	(7,317)	(5,069)	(5,700)
Net unrealized gain (loss) on loan receivables	170	(1,105)	760
Accretion/amortization of discount, premium and other fees	13,232	8,434	14,194
Loans consolidated as part of RCLT 2019-2 transaction			463,177
Foreign currency gain (loss), net	4,091	4,509
Payment of guaranteed loan financing			(177,815)
Transfers	1,138	(714)	1,262
Transfers to real estate owned, held for sale	(9,015)	(11,339)	(2,269)
Provision for loan losses	(8,727)	(33,785)	(3,684)
Balance at Ending	6,997,294	4,023,431	4,054,183
Loans, held for sale, at fair value
Reconcile mortgage loans on real estate
Balance at beginning	340,288	192,511	115,258
Origination of loan receivables	5,356,406	5,076,936	2,621,324
Purchases of loan receivables	75,666		9,149
Proceeds from disposition and principal payment of loan receivables	(5,475,139)	(5,152,861)	(2,628,521)
Loans acquired as part of merger transactions	102,798
Net realized gain (loss) on sale of loan receivables	154,801	218,809	76,274
Net unrealized gain (loss) on loan receivables	(3,023)	5,607	289
Transfers	(1,138)	714	(1,262)
Balance at Ending	$ 552,935	$ 340,288	$ 192,511