Annual report pursuant to Section 13 and 15(d)

Equity Transactions (Details)

v3.10.0.1
Equity Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 30, 2018
Dec. 19, 2016
Sep. 06, 2016
May 26, 2016
Apr. 25, 2016
Mar. 09, 2016
Feb. 04, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]                    
Preferred stock dividend               $ (7,295) $ (7,295) $ (7,295)
Proceeds from issuance of common stock               $ 287,988 $ 0 $ 1,357,577
Series A Preferred Stock                    
Class of Stock [Line Items]                    
Dividend rate, percentage               10.00%    
Preferred stock, liquidation preference (in dollars per share)               $ 50.00 $ 50.00  
Preferred stock, dividend rate               5.00    
Value of a share of common stock (usd per share)               $ 6.49    
Preferred stock shares issued upon conversion               7.7    
Conversion of stock, shares converted (in shares)             120,000      
Preferred stock, shares issued (in shares)               1,458,948    
Preferred stock, shares outstanding (in shares)               1,458,948 1,458,948  
Common Stock                    
Class of Stock [Line Items]                    
Conversion of stock, shares issued (in shares)             719,000      
Shares of common stock issued in public offering (in shares) 25,300,000 40,000,000 29,900,000   25,300,000 15,300,000        
Proceeds from issuance of common stock $ 287,988 $ 634,934 $ 421,864   $ 205,869 $ 94,948        
Common Stock | Big Star Transaction                    
Class of Stock [Line Items]                    
Shares of common stock issued in acquisition (in shares)       9,300,000            
Sales price of shares issued (usd per share)       $ 11.74