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Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $)
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid In Capital [Member]
Returned Earnings/ (Accumulated Deficit) [Member]
Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2013 $ 682,956,000 $ 35,000 $ 369,000 $ 697,610,000 $ (14,188,000) $ (870,000)
Beginning balance, Shares at Dec. 31, 2013   3,450,000 36,888,467      
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures [1]     0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Capital decrease related to Equity Incentive Plan (in shares)     240,277      
Capital decrease related to Equity Incentive Plan 219,000   2,000 217,000    
Issuance of restricted common stock (in shares)     13,931      
Issuance of common stock (in shares)     9,706,000      
Issuance of common stock 158,693,000   97,000 158,596,000    
Offering costs (270,000)     (270,000)    
Convertible senior notes 11,445,000     11,445,000    
Net income 60,698,000          
Change in net unrealized gain on securities available-for-sale 116,000         116,000
Dividends on common stock (52,591,000)       (52,591,000)  
Dividends on preferred stock (5,580,000)       (5,580,000)  
Ending balance at Sep. 30, 2014 $ 855,686,000 $ 35,000 $ 468,000 $ 867,598,000 $ (11,661,000) $ (754,000)
Ending balance, Shares at Sep. 30, 2014   3,450,000 46,848,675      
[1] Rounds to zero.