Variable Interest Entities - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019
Variable Interest Entity [Line Items]
Investments in variable interest entities	$ 57,479	$ 67,967	$ 64,535
Receivables with variable interest entities	4,589	5,030	17,239
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in variable interest entities	51,509	62,407	57,541
Receivables with variable interest entities	2,039	10,099	14,500
Guaranteed amounts to variable interest entities (not to exceed)	$ 60,937	$ 59,792	$ 63,584