Basis of Presentation - VIEs Total Assets and Liabilities (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Total Assets		$ 1,007,542	$ 889,069
Variable Interest Entity, Consolidated, Carrying Amount, Total Liabilities		532,397	245,974
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Total Assets		1,571	9,677
Variable Interest Entity, Consolidated, Carrying Amount, Total Liabilities	[1]	$ 245	$ 308

[1] Prior year comparative has been reclassified to conform with current period presentation.