Borrowings - Encore Private Placement Notes - Narrative (Details) - USD ($)	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020	Aug. 31, 2017
Debt Instrument [Line Items]
Debt issued	$ 422,500,000	$ 583,500,000
Encore private placement notes \| Notes Payable, Other Payables
Debt Instrument [Line Items]
Debt issued			$ 325,000,000
Long-term debt	$ 117,290,000	$ 146,550,000
Stated interest rate (as a percent)	5.625%
Senior secured notes, periodic principal repayment	$ 9,800,000

Face (par) amount of debt instrument at time of issuance.

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