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Notes, Mortgage Notes and Obligations Payable - Senior Notes and Term Loan Facility (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Senior Notes [Member]
New 8.5% Notes [Member]
Oct. 18, 2012
Senior Notes [Member]
New 8.5% Notes [Member]
Nov. 23, 2010
Senior Notes [Member]
10% Notes [Member]
Dec. 31, 2012
Senior Notes [Member]
10% Notes [Member]
Dec. 31, 2010
Senior Notes [Member]
10% Notes [Member]
Dec. 31, 2012
Loans Payable [Member]
Term Loan Facility [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period One [Member]
Senior Notes [Member]
New 8.5% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period One [Member]
Senior Notes [Member]
10% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Two [Member]
Senior Notes [Member]
New 8.5% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Two [Member]
Senior Notes [Member]
10% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Three [Member]
Senior Notes [Member]
New 8.5% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Three [Member]
Senior Notes [Member]
10% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Four [Member]
Senior Notes [Member]
New 8.5% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Four [Member]
Senior Notes [Member]
10% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Five [Member]
Senior Notes [Member]
New 8.5% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Five [Member]
Senior Notes [Member]
10% Notes [Member]
Dec. 31, 2012
Debt Instrument, Redemption, Period Six [Member]
Senior Notes [Member]
New 8.5% Notes [Member]
Dec. 31, 2012
Minimum [Member]
Loans Payable [Member]
Term Loan Facility [Member]
Dec. 31, 2012
Maximum [Member]
Loans Payable [Member]
Term Loan Facility [Member]
Dec. 31, 2012
Treasury Rate [Member]
Debt Instrument, Redemption, Period Two [Member]
Senior Notes [Member]
New 8.5% Notes [Member]
Dec. 31, 2012
Treasury Rate [Member]
Debt Instrument, Redemption, Period Two [Member]
Senior Notes [Member]
10% Notes [Member]
Debt Instrument [Line Items]                                                
Interest rate         8.50%   10.00% 10.00%                                
Percentage of principal amount redeemed                   35.00% 35.00% 100.00% 100.00%                      
Percentage of principal amount outstanding                   65.00% 65.00%                          
Redemption requirement, redemprion period after closing                   90 days                            
Redemption price, percentage                   108.50% 110.00%     104.25% 105.00% 102.125% 102.50% 101.063% 100.00% 100.00%        
Redemption price, make whole amount, percentage                       1.00%                        
Redemption price, basis spread over variable rate used in calculation                                             0.50% 0.50%
Maximum borrowing capacity                 $ 200,000,000.0                              
Weighted average interest rate                 5.25%                              
Repayment terms, percent of annual excess cash flow                 50.00%                              
Repayment terms, percent of annual excess cash flow based on secured leverage ratio                                         25.00% 0.00%    
Repayment terms, percent of net cash proceeds of asset sales and casualty                 100.00%                              
Repayment terms, percent of net cash proceeds from debt issuance                 100.00%                              
Debt face amount         235,000,000.0 250,000,000.0                                    
Net proceeds from sale of debt 0 0 250,000,000     243,200,000                                    
Interest rate computation basis, days in year       360 days     360 days                                  
Capacity to make payments, including dividends             $ 40,600,000