Condensed Consolidated Unaudited Statement of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Capital in Excess of Par Value
Accumulated Distributions in Excess of Earnings
Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2012 $ 1,367,306 $ 2,086 $ 1,883,113 $ (515,712) $ (2,181)
Beginning balance, shares at Dec. 31, 2012 208,597,575 208,597,575      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Distributions to investors (64,656)     (64,656)  
Redemptions of common stock, shares   (12,964)      
Redemptions of common stock (121) 0 (121)    
Changes in redeemable common stock 121   121    
Comprehensive income 8,435     6,971 1,464
Ending balance at Jun. 30, 2013 $ 1,311,085 $ 2,086 $ 1,883,113 $ (573,397) $ (717)
Ending balance, shares at Jun. 30, 2013 208,584,611 208,584,611