Fair Value Measurements - Financial Instruments Not Required to be Carried at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Carrying Amount
Financial Assets
Investment in receivable portfolios, net	$ 2,976,202	$ 3,065,553
Carrying Amount | 2022 Convertible Notes
Financial Liabilities
Debt instrument, fair value disclosure	0	150,000
Carrying Amount | 2023 Exchangeable Notes
Financial Liabilities
Debt instrument, fair value disclosure	172,500	172,500
Carrying Amount | 2025 Convertible Notes
Financial Liabilities
Debt instrument, fair value disclosure	100,000	100,000
Carrying Amount | Senior secured notes
Financial Liabilities
Debt instrument, fair value disclosure	1,358,671	1,606,327
Carrying Amount | Encore private placement notes
Financial Liabilities
Debt instrument, fair value disclosure	78,160	107,470
Estimated Fair Value
Financial Assets
Investment in receivable portfolios, net	3,197,117	3,416,926
Estimated Fair Value | 2022 Convertible Notes
Financial Liabilities
Debt instrument, fair value disclosure	0	195,009
Estimated Fair Value | 2023 Exchangeable Notes
Financial Liabilities
Debt instrument, fair value disclosure	201,547	257,782
Estimated Fair Value | 2025 Convertible Notes
Financial Liabilities
Debt instrument, fair value disclosure	125,509	165,887
Estimated Fair Value | Senior secured notes
Financial Liabilities
Debt instrument, fair value disclosure	1,202,918	1,652,246
Estimated Fair Value | Encore private placement notes
Financial Liabilities
Debt instrument, fair value disclosure	$ 75,041	$ 108,652