Notes Payable - Schedule of Debt (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Notes Payable	$ 371,707	$ 376,243
Series B Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.44%
Carrying Value	$ 0	66,829
Series C Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.64%
Carrying Value	$ 47,740	47,710
Series D Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.72%
Carrying Value	$ 16,883	16,874
Series E Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.46%
Carrying Value	$ 74,442	74,407
Series F Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.55%
Carrying Value	$ 59,523	59,500
Series G Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.64%
Carrying Value	$ 39,667	39,655
Series H Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	3.42%
Carrying Value	$ 30,188	33,564
Series I Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	2.20%
Carrying Value	$ 37,744	37,704
Series J Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.02%
Carrying Value	$ 65,520	$ 0