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LONG-TERM DEBT - 14.0% Senior Notes Due 2021 (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Mar. 26, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Stated interest rate 8.75%    
14.0% Senior Notes due 2021      
Debt Instrument [Line Items]      
Stated interest rate 14.00% 14.00% 14.00%
Principal amount issued to, and held by, a subsidiary $ 453.9    
Interest paid per annum in cash (as a percent) 12.00%    
Interest paid per annum through issuance of payment-in-kind notes (as a percent) 2.00%    
Senior Notes | 14.0% Senior Notes due 2021      
Debt Instrument [Line Items]      
Principal amounts outstanding $ 1,781.6    
Stated interest rate 14.00%