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Consolidated Statements of Stockholders' Equity (USD $)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2009 $ 1,175,506,000 $ 1,243,000 $ 1,311,053,000 $ (136,790,000)
Beginning balance, shares at Dec. 31, 2009   124,299,423    
Dividends per common share 37,488,000 39,000 37,563,000 (114,000)
Dividends per common share, shares   3,865,961    
Issuance and vesting of common stock grants, net 5,000 6,000 (1,000)  
Issuance and vesting of common stock grants, net, shares   623,659    
Sale of common stock in secondary offerings, less placement fees and expenses 209,690,000 258,000 209,432,000  
Sale of common stock in secondary offerings, less placement fees and expenses, shares   25,781,500    
Net loss (9,172,000)     (9,172,000)
Ending Balance 1,413,517,000 1,546,000 1,558,047,000 (146,076,000)
Ending balance, shares at Dec. 31, 2010   154,570,543    
Beginning Balance at Dec. 31, 2010 1,413,517,000 1,546,000 1,558,047,000 (146,076,000)
Dividends per common share (53,961,000)   230,000 (54,191,000)
Dividends per common share, shares   1,932    
Issuance and vesting of common stock grants, net 647,000 5,000 642,000  
Issuance and vesting of common stock grants, net, shares   511,222    
Sale of common stock in secondary offerings, less placement fees and expenses 149,632,000 124,000 149,508,000  
Sale of common stock in secondary offerings, less placement fees and expenses, shares   12,418,662    
Net loss (7,678,000) 0 0 (7,678,000)
Ending Balance 1,502,157,000 1,675,000 1,708,427,000 (207,945,000)
Ending balance, shares at Dec. 31, 2011   167,502,359    
Beginning Balance at Dec. 31, 2011 1,502,157,000 1,675,000 1,708,427,000 (207,945,000)
Dividends per common share (58,327,000)   174,000 (58,501,000)
Issuance and vesting of common stock grants, net 1,562,000 4,000 1,558,000  
Issuance and vesting of common stock grants, net, shares   431,810    
Sale of common stock in secondary offerings, less placement fees and expenses 199,790,000 200,000 199,590,000  
Sale of common stock in secondary offerings, less placement fees and expenses, shares   20,000,000    
Issuance of common stock in private placement for portfolio acquisition 66,523,000 72,000 66,451,000  
Issuance of common stock in private placement for portfolio acquisition, shares   7,211,538    
Net loss (16,592,000)     (16,592,000)
Ending Balance $ 1,695,113,000 $ 1,951,000 $ 1,976,200,000 $ (283,038,000)
Ending balance, shares at Dec. 31, 2012   195,145,707