Business Segments - Segment Reporting Information By Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Revenues	$ 314,533	$ 269,619
Labor and Related Expense	70,738	73,323
Outside Fees And Services Expenses	20,884	21,103
Operating Income (Loss)	103,254	74,577
Interest Income (Expense), Net	(63,518)	(60,970)
Other Nonoperating Income (Expense)	800	(231)
Income before income taxes	40,536	13,376
Income tax expense	8,764	4,312
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Segment Reporting Information [Line Items]
Revenues	32,106	33,088
Other Operating Income (Expense), Net	(3,155)	571
Interest Income (Expense), Net	1,181	736
Depreciation and amortization	32	42
Income tax expense	202	1,332
Operating Segments
Segment Reporting Information [Line Items]
Revenues	282,427	236,531
Labor and Related Expense	60,201	64,672
Legal Collection Expenses	62,602	45,501
Outside Fees And Services Expenses	16,291	17,011
Segment Reporting, Other Segment Item, Amount	36,924	35,341
Operating Income (Loss)	106,409	74,006
Interest expense, net	63,518	60,970
Depreciation and amortization	1,708	2,938
Income tax expense	8,764	4,312
United States Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	156,795	136,381
Labor and Related Expense	39,497	45,493
Legal Collection Expenses	53,140	36,862
Outside Fees And Services Expenses	11,812	12,826
Segment Reporting, Other Segment Item, Amount	22,157	23,821
Operating Income (Loss)	30,189	17,379
Interest expense, net	41,106	37,939
Depreciation and amortization	854	2,216
Income tax expense	(298)	(2,241)
Europe Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	125,632	100,150
Labor and Related Expense	20,704	19,179
Legal Collection Expenses	9,462	8,639
Outside Fees And Services Expenses	4,479	4,185
Segment Reporting, Other Segment Item, Amount	14,767	11,520
Operating Income (Loss)	76,220	56,627
Interest expense, net	23,593	23,767
Depreciation and amortization	822	680
Income tax expense	$ 8,860	$ 5,221