Annual report pursuant to Section 13 and 15(d)

Common and Preferred Stock Issuances (Details)

v3.8.0.1
Common and Preferred Stock Issuances (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 04, 2017
Aug. 03, 2017
May 09, 2017
Feb. 28, 2017
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]            
Common stock, par value (in dollars per share)         $ 0.16667 $ 0.16667
Preferred stock, par value (in dollars per share)         1 $ 1
Preferred stock, liquidation preference per share (in dollars per share)         $ 100  
Issuance of common stock and issuance of mandatory convertible preferred stock         $ 72,300  
Conversion rate, measurement period         20 days  
Preferred stock, dividends declared (in dollars per share) $ 1.8125 $ 1.8125 $ 2.4771      
Common Stock            
Class of Stock [Line Items]            
Issuance of common stock and issuance of mandatory convertible preferred stock (in shares)       12,000,000    
Shares issued, price per share (in dollars per share)       $ 2.10    
Issuance of common stock and issuance of mandatory convertible preferred stock         $ 24,059  
Common Stock | Minimum            
Class of Stock [Line Items]            
Conversion rate (in shares)         41.4079  
Common Stock | Maximum            
Class of Stock [Line Items]            
Conversion rate (in shares)         47.6190  
Preferred Stock            
Class of Stock [Line Items]            
Issuance of common stock and issuance of mandatory convertible preferred stock (in shares)       500,000    
Series A Mandatory Convertible Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, dividend rate         7.25% 7.25%