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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2018 - 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 related to Equity Incentive Plan (in shares)     374,580    
Capital increase 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  
Exchange of convertible senior notes for common stock (in shares)     10,744,577    
Exchange 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)