Fair Value Measurements - Schedule of Carrying Amount And Estimated Fair Value Of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, net $ 71,495 $ 71,895
Revolving Credit Facility 320,005 87,718
Convertible notes, net 743,334 784,175
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable, net 66,415 66,578
Revolving Credit Facility 320,000 86,000
Convertible notes, net 709,183 702,642
Term Loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Term loan, net 420,042 428,441
Term Loan | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Term loan, net 418,880 418,471
Senior Unsecured Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable, net 293,985 283,473
Senior Unsecured Notes | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable, net 295,135 295,112
Mortgages and Notes Payable    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable, net 2,227,511 2,282,142
Mortgages and Notes Payable | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable, net $ 2,103,425 $ 2,162,403