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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid In Capital [Member]
Accumulated Deficit [Member]
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)     345,996    
Capital increase (decrease) related to Equity Incentive Plan (1,385)   $ 4 (1,389)  
Issuance of common stock (in shares)     15,525,000    
Issuance of common stock 275,879   $ 155 275,724  
Offering costs (377)     (377)  
Net income 49,433       49,433
Dividends declared on preferred stock (6,835)       (6,835)
Dividends declared on common stock - $0.46 per share (57,328)       (57,328)
Stockholders' equity, ending balance (in shares) at Mar. 31, 2018   13,670,393 122,992,231    
Stockholders' equity, ending balance at Mar. 31, 2018 2,347,530 $ 137 $ 1,230 2,444,036 (97,873)
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)     433,426    
Capital increase (decrease) related to Equity Incentive Plan (1,095)   $ 4 (1,099)  
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  
Net income 67,758       67,758
Dividends declared on preferred stock (6,835)       (6,835)
Dividends declared on common stock - $0.46 per share (63,529)       (63,529)
Stockholders' equity, ending balance (in shares) at Mar. 31, 2019   13,670,393 136,254,352    
Stockholders' equity, ending balance at Mar. 31, 2019 $ 2,539,824 $ 137 $ 1,363 $ 2,671,100 $ (132,776)