Borrowings - Senior Secured Notes - Table and Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Senior secured notes	$ 1,622,407	$ 1,651,619
Cabot 2023 Notes \| Secured Debt
Debt Instrument [Line Items]
Senior secured notes	$ 311,779	309,034
Stated interest rate (as a percent)	7.50%
Encore 2025 Notes \| Secured Debt
Debt Instrument [Line Items]
Senior secured notes	$ 410,466	426,752
Stated interest rate (as a percent)	4.875%
Encore 2026 Notes \| Secured Debt
Debt Instrument [Line Items]
Senior secured notes	$ 413,466	409,827
Stated interest rate (as a percent)	5.375%
Encore 2028 Floating Rate Notes \| Secured Debt
Debt Instrument [Line Items]
Senior secured notes	$ 486,696	$ 506,006
Variable rate floor	0.00%
Euro Interbank Offered Rate (EURIBOR) \| Encore 2028 Floating Rate Notes \| Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	4.25%

Debt Instrument, Variable Rate, Floor

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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