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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2008 $ 1,017,632 $ 901 $ 1,100,541 $ (83,810)
Beginning balance, shares at Dec. 31, 2008   90,050,264    
Share repurchases (749) 0 (749) 0
Share repurchases, shares   0    
Dividends of $0.33, $0.33 and $0.32 for 2009, 2010 and 2011, respectively per common share (41,890) 0 0 (41,890)
Issuance and vesting of common stock grants, net 6,628 3 6,625 0
Issuance and vesting of common stock grants, net, shares   280,265    
Sale of common stock in secondary offerings, less placement fees and expenses of $669, $413, and $262 for 2009, 2010 and 2011, respectively 204,975 339 204,636 0
Sale of common stock in secondary offerings, less placement fees and expenses of $669, $413, and $262 for 2009, 2010 and 2011, respectively, shares   33,968,894    
Net loss (11,090) 0 0 (11,090)
Ending Balance 1,175,506 1,243 1,311,053 (136,790)
Ending balance, shares at Dec. 31, 2009   124,299,423    
Beginning Balance at Dec. 31, 2009 1,175,506 1,243 1,311,053 (136,790)
Dividends of $0.33, $0.33 and $0.32 for 2009, 2010 and 2011, respectively per common share 37,488 39 37,563 (114)
Dividends of $0.33, $0.33 and $0.32 for 2009, 2010 and 2011, respectively per common share, shares   3,865,961    
Issuance and vesting of common stock grants, net 5 6 (1) 0
Issuance and vesting of common stock grants, net, shares   623,659    
Sale of common stock in secondary offerings, less placement fees and expenses of $669, $413, and $262 for 2009, 2010 and 2011, respectively 209,690 258 209,432 0
Sale of common stock in secondary offerings, less placement fees and expenses of $669, $413, and $262 for 2009, 2010 and 2011, respectively, shares   25,781,500    
Net loss (9,172) 0 0 (9,172)
Ending Balance 1,413,517 1,546 1,558,047 (146,076)
Ending balance, shares at Dec. 31, 2010   154,570,543    
Beginning Balance at Dec. 31, 2010 1,413,517 1,546 1,558,047 (146,076)
Dividends of $0.33, $0.33 and $0.32 for 2009, 2010 and 2011, respectively per common share (53,961) 0 230 (54,191)
Dividends of $0.33, $0.33 and $0.32 for 2009, 2010 and 2011, respectively per common share, shares   1,932    
Issuance and vesting of common stock grants, net 647 5 642 0
Issuance and vesting of common stock grants, net, shares   511,222    
Sale of common stock in secondary offerings, less placement fees and expenses of $669, $413, and $262 for 2009, 2010 and 2011, respectively 149,632 124 149,508 0
Sale of common stock in secondary offerings, less placement fees and expenses of $669, $413, and $262 for 2009, 2010 and 2011, respectively, shares   12,418,662    
Net loss (7,678) 0 0 (7,678)
Ending Balance $ 1,502,157 $ 1,675 $ 1,708,427 $ (207,945)
Ending balance, shares at Dec. 31, 2011   167,502,359