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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