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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, 2013 $ 1,680,691 $ 1,955 $ 1,979,613 $ (300,877)
Beginning balance, shares at Dec. 31, 2013   195,470,791    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends per common share (81,041)   227 (81,268)
Issuance and vesting of common stock grants, net 2,898 $ 3 2,895  
Issuance and vesting of common stock grants, net, shares   275,690    
Sale of common stock in secondary offerings, less placement fees and expenses 63,062 $ 42 63,020  
Sale of common stock in secondary offerings, less placement fees and expenses, shares   4,217,560    
Net income 163,377     163,377
Ending Balance at Dec. 31, 2014 1,828,987 $ 2,000 2,045,755 (218,768)
Ending 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, less placement fees and expenses 7,790 $ 5 7,785  
Sale of common stock in secondary offerings, less placement fees and expenses, 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    
Net income 114,796     114,796
Repurchase of common shares, shares   (728,237)    
Repurchase of common stock, value (6,512) $ (7) (6,505) 0
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