Basis of Presentation - VIEs Total Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Total Assets	$ 942,363	$ 997,750
Variable Interest Entity, Consolidated, Carrying Amount, Total Liabilities	506,911	532,983
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Total Assets	1,558	1,543
Variable Interest Entity, Consolidated, Carrying Amount, Total Liabilities	$ 258	$ 230