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Earnings (Loss) Per Share - Narrative (Details) - $ / shares
shares in Thousands
9 Months Ended
Sep. 30, 2017
Aug. 31, 2017
5.25% Convertible Notes due December 30, 2019    
Dilutive Earnings Per Share [Line Items]    
Stated interest rate (as a percent) 5.25% 5.25%
Second Lien Notes    
Dilutive Earnings Per Share [Line Items]    
Debt conversion price (in dollars per share) $ 3.77  
Outstanding common stock equivalents (in shares) 43,700