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Debt, Net - Encore Senior Secured Notes - Narrative (Details) - Senior Notes - USD ($)	6 Months Ended
	Jun. 30, 2018	Aug. 31, 2017
Debt Instrument [Line Items]
Basis spread over the current Treasury Rate (as a percent)	50.00%
2017 Senior Secured Notes
Debt Instrument [Line Items]
Debt issued	$ 325,000,000	$ 325,000,000.0
Stated interest rate (as a percent)	5.625%
Senior secured notes, periodic principal repayment	$ 16,300,000.0

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