Subsequent Events (Details) - USD ($)
Feb. 16, 2016
Dec. 31, 2015
Subsequent Event [Line Items]    
Preferred stock, par or stated value per share (in USD per share)   $ 0.01
Subsequent Event    
Subsequent Event [Line Items]    
Long-term purchase commitment, period 10 years  
TCP-ASC ACHI Series LLLP | Subsequent Event    
Subsequent Event [Line Items]    
Preferred stock, value, issued $ 200,000,000  
TCP-ASC ACHI Series LLLP | Series A Preferred Stock | Subsequent Event    
Subsequent Event [Line Items]    
Preferred stock, shares issued 200,000  
Preferred stock, dividend rate, percentage 8.00%  
Preferred stock, par or stated value per share (in USD per share) $ 0.01  
TCP-ASC ACHI Series LLLP | Common Stock | Subsequent Event    
Subsequent Event [Line Items]    
Class of warrant or right, unissued 60,000,000