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Capital Structure - Series A Preferred Stock (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 15, 2018
USD ($)
member
$ / shares
shares
Dec. 31, 2017
vote
Series A Preferred Stock    
Class of Stock [Line Items]    
Number of votes per share (vote) | vote   1
Subsequent Event    
Class of Stock [Line Items]    
Preferred stock, dividend rate percentage 14.50%  
Convertible preferred stock, shares issued upon conversion | shares 0.0555556  
Convertible preferred stock, conversion price per share | $ / shares $ 18.00  
Ten Percent or Greater Ownership | Subsequent Event    
Class of Stock [Line Items]    
Number of elected directors | member 2  
Preferred stock, ownership percentage 10.00%  
Greater than Five and Less than Ten Percent Ownership | Subsequent Event    
Class of Stock [Line Items]    
Number of elected directors | member 1  
Greater than Five and Less than Ten Percent Ownership | Subsequent Event | Minimum    
Class of Stock [Line Items]    
Preferred stock, ownership percentage 5.00%  
Greater than Five and Less than Ten Percent Ownership | Subsequent Event | Maximum    
Class of Stock [Line Items]    
Preferred stock, ownership percentage 10.00%  
EBITDA Non-Compliance | Subsequent Event | Silver Private Holdings I, LLC    
Class of Stock [Line Items]    
Fair value approval threshold $ 10.0  
Fair market value of transaction, individual 5.0  
Fair market value of transaction, aggregate 10.0  
Capital expenditure threshold $ 25.0  
Conversion of Stock | Subsequent Event | Silver Private Holdings I, LLC    
Class of Stock [Line Items]    
Percentage ownership after conversion 19.90%  
Voting percentage threshold of ownership 19.99%