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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid In Capital
Accumulated Deficit
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2017   13,670,393 107,121,235    
Stockholders' equity, beginning balance at Dec. 31, 2017 $ 2,088,143 $ 137 $ 1,071 $ 2,170,078 $ (83,143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Capital increase (decrease) related to Equity Incentive Plan (in shares)     374,580    
Capital increase (decrease) related to Equity Incentive Plan 6,677   $ 5 6,672  
Issuance of common stock (in shares)     15,525,000    
Issuance of common stock 275,879   $ 155 275,724  
Conversions of convertible senior notes for common stock (in shares)     10,744,577    
Conversions of convertible senior notes for common stock 178,566   $ 107 178,459  
Offering costs (465)     (465)  
Net income 166,996       166,996
Dividends declared on preferred stock (20,505)       (20,505)
Dividends declared on common stock - $0.46 per share (176,920)       (176,920)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2018   13,670,393 133,765,392    
Stockholders' equity, ending balance at Sep. 30, 2018 2,518,371 $ 137 $ 1,338 2,630,468 (113,572)
Stockholders' equity, beginning balance (in shares) at Jun. 30, 2018   13,670,393 123,020,301    
Stockholders' equity, beginning balance at Jun. 30, 2018 2,342,653 $ 137 $ 1,230 2,447,973 (106,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Capital increase (decrease) related to Equity Incentive Plan (in shares)     514    
Capital increase (decrease) related to Equity Incentive Plan 4,049   $ 1 4,048  
Conversions of convertible senior notes for common stock (in shares)     10,744,577    
Conversions of convertible senior notes for common stock 178,566   $ 107 178,459  
Offering costs (12)     (12)  
Net income 62,217       62,217
Dividends declared on preferred stock (6,836)       (6,836)
Dividends declared on common stock - $0.46 per share (62,266)       (62,266)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2018   13,670,393 133,765,392    
Stockholders' equity, ending balance at Sep. 30, 2018 2,518,371 $ 137 $ 1,338 2,630,468 (113,572)
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2018   13,670,393 133,853,565    
Stockholders' equity, beginning balance at Dec. 31, 2018 2,509,747 $ 137 $ 1,339 2,638,441 (130,170)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Capital increase (decrease) related to Equity Incentive Plan (in shares)     460,830    
Capital increase (decrease) related to Equity Incentive Plan 7,088   $ 4 7,084  
Issuance of common stock (in shares)     17,250,000    
Issuance of common stock 315,157   $ 172 314,985  
Redemption of preferred stock (in shares)   (6,900,000)      
Redemption of preferred stock (172,500) $ (69)   (172,431)  
Conversions of convertible senior notes for common stock (in shares)     1,967,361    
Conversions of convertible senior notes for common stock 33,778   $ 20 33,758  
Offering costs (418)     (418)  
Net income 158,271       158,271
Dividends declared on preferred stock (15,139)       (15,139)
Dividends declared on common stock - $0.46 per share (206,474)       (206,474)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2019   6,770,393 153,531,756    
Stockholders' equity, ending balance at Sep. 30, 2019 2,629,510 $ 68 $ 1,535 2,821,419 (193,512)
Stockholders' equity, beginning balance (in shares) at Jun. 30, 2019   6,770,393 153,531,597    
Stockholders' equity, beginning balance at Jun. 30, 2019 2,671,399 $ 68 $ 1,535 2,817,542 (147,746)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Capital increase (decrease) related to Equity Incentive Plan (in shares)     159    
Capital increase (decrease) related to Equity Incentive Plan 3,889     3,889  
Offering costs (12)     (12)  
Net income 29,089       29,089
Dividends declared on preferred stock (3,385)       (3,385)
Dividends declared on common stock - $0.46 per share (71,470)       (71,470)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2019   6,770,393 153,531,756    
Stockholders' equity, ending balance at Sep. 30, 2019 $ 2,629,510 $ 68 $ 1,535 $ 2,821,419 $ (193,512)