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Share-Based Compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share vesting period 5 years    
Stock Options [Member] | Stock Option Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, fixed exercise price, in dollars per share $ 10.00    
Number of shares authorized, in shares 500,000    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested, December 31, 2011, Number of common shares, in shares 17,400,000 6,000,000 0
Unvested, December 31, 2011, Weighted Average Issue Price, in dollars per share $ 9.48 $ 10.00 $ 0.00
Granted, Number of Shares, in shares 15,000,000 6,000,000  
Granted, Weighted-Average Issue Price, in dollars per share $ 9.40 $ 10.00  
Vested, Number of Shares, in shares (600,000)    
Vested, Weighted-Average Issue Price, in dollars per share $ 10.00    
Forfeitures, Number of Shares, in shares (3,000,000)    
Forfeitures, Weighted-Average Issue Price, in dollars per share $ 10.00    
Restricted Stock [Member] | Restricted Share Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted automatically upon election to board of directors, in shares 3,000    
Restricted share vesting period 5 years    
Periodic vesting percentage 20.00%    
Maximum authorized amount as a percentage of shares authorized 5.00%    
Allocated Share-based Compensation Expense $ 21,000 $ 9,000  
Common Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Issued in lieu of cash for services, in shares 3,639 3,750  
Shares issued in lieu of cash for services, fees earned for services performed $ 33,000 $ 34,000  
Contract Purchase Price [Member] | Maximum [Member] | Restricted Stock [Member] | Restricted Share Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair Value of Restricted Share Grants 0.00%    
Net Sale Proceeds, after Return of Capital Contributions and Annual Targeted Investor Return [Member] | Maximum [Member] | Restricted Stock [Member] | Restricted Share Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair Value of Restricted Share Grants 15.00%    
Pre-tax Non-compounded Return on Capital Contribution [Member] | Maximum [Member] | Restricted Stock [Member] | Restricted Share Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair Value of Restricted Share Grants 6.00%    
Average Invested Assets [Member] | Maximum [Member] | Restricted Stock [Member] | Restricted Share Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair Value of Restricted Share Grants 2.00%    
Net Income, Excluding Additions to Non-cash Reserves and Gains on Sales of Assets [Member] | Maximum [Member] | Restricted Stock [Member] | Restricted Share Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair Value of Restricted Share Grants 25.00%    
Disposition Fees [Member] | Maximum [Member] | Restricted Stock [Member] | Restricted Share Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair Value of Restricted Share Grants 3.00%