Valuation Fair Value, Other Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 34,816	$ 69,028	$ 58,166
Due from brokers	18,824	88,662
Reverse repurchase agreements	499	117,505
Repurchase agreements	842,455	1,064,835
Due to brokers	45,666	1,959
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	34,816	69,028
Due from brokers	18,824	88,662
Reverse repurchase agreements	499	117,505
Repurchase agreements	842,455	1,064,835
Due to brokers	45,666	1,959
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	34,816	69,028
Due from brokers	18,824	88,662
Reverse repurchase agreements	499	117,505
Repurchase agreements	842,455	1,064,835
Due to brokers	$ 45,666	$ 1,959