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Debt Obligations, net (Details 4) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
February 2013 Secured Credit Facility
Jun. 30, 2013
February 2013 Secured Credit Facility
Feb. 11, 2013
February 2013 Secured Credit Facility
Jun. 30, 2013
October 2012 Secured Credit Facility
Feb. 11, 2013
October 2012 Secured Credit Facility
Oct. 15, 2012
October 2012 Secured Credit Facility
Mar. 31, 2012
2012 Secured Credit Facilities
tranches
Mar. 31, 2012
Secured 2012 Tranche A-1 Facility Due 2016
Jun. 30, 2013
Secured 2012 Tranche A-1 Facility Due 2016
Jun. 30, 2013
Secured 2012 Tranche A-1 Facility Due 2016
Mar. 31, 2012
Secured 2012 Tranche A-2 Facility Due 2017
Jun. 30, 2013
Secured 2012 Tranche A-2 Facility Due 2017
Mar. 31, 2012
Unsecured Notes LIBOR plus 0.50% senior convertible notes
Jun. 30, 2013
Unsecured Notes LIBOR plus 0.50% senior convertible notes
Mar. 31, 2012
Unsecured Line of credit due June 2012
Jun. 30, 2013
Unsecured Notes 5.50% senior notes
Jun. 30, 2013
Secured 2011 Tranche A-2 Facility Due 2014
Jun. 30, 2013
Unsecured Notes 3.875% senior notes
May 31, 2013
Unsecured Notes 3.875% senior notes
Jun. 30, 2013
Unsecured Notes 4.875% senior notes
May 31, 2013
Unsecured Notes 4.875% senior notes
May 31, 2013
Unsecured Notes 8.625% senior notes
Jun. 30, 2013
Unsecured Notes 8.625% senior notes
May 31, 2013
Unsecured Notes 5.95% senior notes
Jun. 30, 2013
Unsecured Notes 5.95% senior notes
Jun. 30, 2013
Unsecured Notes 5.95% senior notes
Jun. 30, 2013
Unsecured Credit Facilities
Jun. 30, 2013
Secured Credit Facility
Feb. 11, 2013
Minimum
October 2012 Secured Credit Facility
Feb. 11, 2013
Maximum
October 2012 Secured Credit Facility
Jun. 30, 2013
Lenders from Original Credit Facility Not Participating in New Credit Facility
Debt Instrument [Line Items]                                                                      
Line of credit facility, maximum borrowing capacity             $ 1,706,980,000     $ 1,820,000,000                                                  
Debt instrument, covenant, minimum collateral coverage, one                 125.00%                                                    
Debt instrument, covenant, minimum collateral coverage, two                                                                 137.50% 150.00%  
Debt instrument, collateral, percent of proceeds from principal repayments and sales applied to repayment, one                 100.00%                                                    
Debt instrument, collateral, percent of proceeds from principal repayments and sales applied to repayment, two                 50.00%                                                    
Debt instrument, covenant, minimum collateral coverage, three                 150.00%                                                    
Line of credit facility, lender fees         17,100,000 17,100,000                                                          
Line of credit facility, capitalized lender fees         14,400,000 14,400,000                                                          
Line of credit facility, lender fees, amount recorded in gain (loss) on early extinguishment of debt         2,700,000 2,700,000                                                          
Line of credit facility, third party fees           3,800,000                                                          
Line of credit facility, third party fees, amount recognized           3,600,000                                                          
Line of credit facility, third party fees, amount capitalized           200,000                                                          
Percentage of REIT taxable income permitted for distribution under debt covenants           100.00%                                                   100.00%      
Debt instrument, amount of real estate assets or interests available to distribute           200,000,000                                                          
Line of credit facility, amortization repayments           109,900,000   113,000,000                                                      
Debt instrument, unamortized discounts and financing fees         25,600,000 25,600,000   30,500,000                                                      
Borrowings on debt instrument                     880,000,000 410,000,000     470,000,000                                        
Number of tranches                     2                                                
Percentage of par credit facilities were issued at                         98.00% 98.00%   98.50%                                      
Repayment of principal amount                           401,900,000     606,700,000   244,000,000 90,300,000                              
Effective interest rate (as a percent)         4.50% 4.50%             5.25% 5.25%   7.00%   5.50%                                  
Minimum aggregate cumulative amortization payment                         41,000,000 41,000,000                                          
Gain (loss) on early extinguishment of debt, net (15,242,000) (4,868,000) (24,784,000) (3,164,000) 1,700,000 2,500,000   800,000         (1,300,000) (4,200,000)                             (9,500,000) 8,800,000         (4,900,000)
Periods following the initial payment of amortization that additional amortization payments are due                                         6 months                            
Principal amount                                             265,000,000   300,000,000                    
Stated interest rate (as a percent)                                           3.875% 3.875% 4.875% 4.875% 8.625% 8.625% 5.95% 5.95% 5.95%          
Extinguishment of debt, amount                                                   96,800,000   448,500,000              
Minimum ratio of unencumbered assets to unsecured indebtedness                                                             1.2        
Multiple of the minimum collateral coverage on outstanding borrowings                                                               1.25      
Aggregate equity value permitted to be distributed                                                               $ 200,000,000