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Debt Obligations (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2015
Jan. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]              
Gain on extinguishment of debt, net     $ 137 $ 460 $ 922 $ (2,573)  
Long-term debt     5,953,520   5,953,520    
Accrued interest     23,300   23,300   $ 20,400
Secured Debt [Member]              
Debt Instrument [Line Items]              
Long-term debt     2,615,067   2,615,067   3,116,882
Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Long-term debt     1,218,453   1,218,453   $ 243,453
Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt repaid $ 125,000            
Term Loan [Member]              
Debt Instrument [Line Items]              
Long-term debt     600,000   600,000    
Mortgages [Member] | Secured Debt [Member]              
Debt Instrument [Line Items]              
Debt repaid         487,700    
Notes Payable, Other Payables [Member] | Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Debt repaid         225,000    
3.850% Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Term loan face amount   $ 700,000          
Stated percentage   3.85%          
Redemption price, percentage of principal amount   100.00%          
3.875% Senior Notes due 2022 [Member]              
Debt Instrument [Line Items]              
Term loan face amount $ 500,000            
Stated percentage 3.875%            
Redemption price, percentage of principal amount 100.00%            
Unsecured Credit Facility and 3.850% Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Debt subject to maintenance of various financial covenants     2,750,000   2,750,000    
Revolving Credit Facility [Member] | Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity     $ 1,250,000   $ 1,250,000