Debt - Summary of Presents the Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Assets
Cash	$ 4,323		$ 4,509	$ 10,330
Net finance receivables	1,773,743		1,771,410	1,688,937
Allowance for credit losses	(185,400)	$ (187,100)	(187,400)	(181,400)	$ (183,800)	$ (178,800)
Restricted cash	138,891		124,164	$ 131,132
Other assets	21,224		29,419
Total assets	1,789,052		1,794,527
Liabilities:
Net Debt	1,372,833		1,395,236
Accounts payable and accrued expenses	34,030		40,442
Total liabilities	1,444,149		1,472,254
VIEs [Member]
Assets
Cash	380		378
Net finance receivables	1,308,676		1,278,568
Allowance for credit losses	134,533		133,207
Restricted cash	118,031		123,899
Other assets	2,967		2,880
Total assets	1,295,521		1,272,518
Liabilities:
Net Debt	1,227,841		1,200,380
Accounts payable and accrued expenses	33		218
Total liabilities	$ 1,227,874		$ 1,200,598