Finance Receivables, net Finance Receivables, net (Recoveries) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Recoveries	$ 557,170	$ 506,076
Less - amounts reclassified to portfolio income	269,579	240,958
Recoveries collected and applied to Finance receivables, net	287,591	265,118
Amortized cost	0		$ 0
Balance as of end of period	4,637,094	4,308,334	4,688,024	$ 4,140,742
Initial negative allowance for expected recoveries - acquisitions	220,850	291,702
Foreign currency translation adjustment	(28,075)	113,086
Changes in estimated recoveries	43,886	27,922
Vesting of restricted stock	0	0
Additional Paid-in Capital
Financing Receivable, Allowance for Credit Losses [Line Items]
Vesting of restricted stock	(1)	(2)
Common Stock
Financing Receivable, Allowance for Credit Losses [Line Items]
Vesting of restricted stock	1	2
Government Bonds and Fixed Income Funds [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	114,785		64,825
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax			109
Debt Securities, Available-for-Sale	114,754		64,934
Core
Financing Receivable, Allowance for Credit Losses [Line Items]
Recoveries	514,154	460,969
Less - amounts reclassified to portfolio income	258,248	229,486
Recoveries collected and applied to Finance receivables, net	255,906	231,483
Balance as of end of period	4,344,825	3,986,864	4,383,201	3,809,723
Initial negative allowance for expected recoveries - acquisitions	202,950	273,893
Foreign currency translation adjustment	(25,774)	108,406
Changes in estimated recoveries	40,354	26,325
Insolvency
Financing Receivable, Allowance for Credit Losses [Line Items]
Recoveries	43,016	45,107
Less - amounts reclassified to portfolio income	11,331	11,472
Recoveries collected and applied to Finance receivables, net	31,685	33,635
Balance as of end of period	292,269	321,470	$ 304,823	$ 331,019
Initial negative allowance for expected recoveries - acquisitions	17,900	17,809
Foreign currency translation adjustment	(2,301)	4,680
Changes in estimated recoveries	$ 3,532	$ 1,597