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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning Balance at Dec. 31, 2014 $ 1,828,987 $ 2,000 $ 2,045,755 $ (218,768)
Beginning balance, shares at Dec. 31, 2014   199,964,041    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends per common share (100,789)   353 (101,142)
Issuance and vesting of common stock grants, net 2,987 $ 2 2,985  
Issuance and vesting of common stock grants, net, shares   253,130    
Sale of common stock in secondary offerings, net of placement fees and expenses of $179 7,790 $ 5 7,785  
Sale of common stock in secondary offerings, net of placement fees and expenses of $719, shares   524,606    
Net income 85,630     85,630
Ending Balance at Dec. 31, 2015 1,824,605 $ 2,007 2,056,878 (234,280)
Ending balance, shares at Dec. 31, 2015   200,741,777    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends per common share (100,738)   358 (101,096)
Issuance and vesting of common stock grants, net 4,636 $ 2 4,634  
Issuance and vesting of common stock grants, net, shares   187,362    
Share repurchases (6,512) $ (7) (6,505)  
Share repurchases, shares   (728,237)    
Net income 114,796     114,796
Ending Balance at Dec. 31, 2016 1,836,787 $ 2,002 2,055,365 (220,580)
Ending balance, shares at Dec. 31, 2016   200,200,902    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends per common share (100,682)   424 (101,106)
Issuance and vesting of common stock grants, net 5,663 $ 1 5,662  
Issuance and vesting of common stock grants, net, shares   105,831    
Net income 91,877     91,877
Ending Balance at Dec. 31, 2017 $ 1,833,645 $ 2,003 $ 2,061,451 $ (229,809)
Ending balance, shares at Dec. 31, 2017   200,306,733