Related Party Transactions, Expense Support (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Expense Support (Reimbursement) [Line Items]
Amount of Expense Support Received	$ 0	$ (2,650)
Expense Support Reimbursed	(1,479)
Expense Support Subject to Reimbursement	3,194
Net Investment Income
Schedule of Expense Support (Reimbursement) [Line Items]
Amount of Expense Support Received	1,630	(2,650)
2019
Schedule of Expense Support (Reimbursement) [Line Items]
Expense Support Reimbursed				$ (970)
Expense Support Subject to Reimbursement				402
2020
Schedule of Expense Support (Reimbursement) [Line Items]
Expense Support Reimbursed			$ (509)
Expense Support Subject to Reimbursement			2,792
2018
Schedule of Expense Support (Reimbursement) [Line Items]
Expense Support Reimbursed					$ (353)
Manager Sub Manager
Schedule of Expense Support (Reimbursement) [Line Items]
Amount of Expense Support Received	$ 4,673	$ (5,100)	$ 3,301	$ 1,372