Fair Value Measurements - Schedule of Carrying Amount And Estimated Fair Value Of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, net $ 75,749 $ 110,019
Revolving Credit Facilities 107,841 0
Convertible notes, net 837,650 713,095
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, net 69,218 104,003
Revolving Credit Facilities 105,000 0
Convertible notes, net 699,465 690,098
Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, net 378,223 338,366
Term Loan | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable, net 368,400 322,902
Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable, net 300,186 0
Senior Unsecured Notes | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable, net 295,215 0
Mortgages and Notes Payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable, net 2,401,124 3,220,239
Mortgages and Notes Payable | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable, net $ 2,241,783 $ 3,079,787