Variable Interest Entities - Assets and Liabilities of Consolidated CLO (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Cash and cash equivalents	$ 273,316	$ 563,217
Carrying Value	15,534,090	12,217,352
Investment securities	670,887	736,658
Accrued interest receivable	108,126	95,980
Other assets	294,670	190,748
Total Assets	81,980,864	80,873,509
Liabilities
Accounts payable, accrued expenses and other liabilities	210,080	206,845
Collateralized loan obligations and single asset securitization, net	2,614,230	930,554
Total Liabilities	77,133,752	76,010,933
Total loans held-for-investment
Assets:
Carrying Value	13,350,571	11,164,517
CLOs and SASB | Primary beneficiary
Assets:
Cash and cash equivalents	22,018	96,998
Investment securities	11,950	0
Accrued interest receivable	8,796	5,454
Other assets	66,003	557
Total Assets	3,123,658	1,105,450
Liabilities
Accounts payable, accrued expenses and other liabilities	5,501	663
Collateralized loan obligations and single asset securitization, net	2,614,230	930,554
Total Liabilities	2,619,731	931,217
CLOs and SASB | Primary beneficiary | Total loans held-for-investment
Assets:
Carrying Value	$ 3,014,891	$ 1,002,441