Fair Value Measurements - Summary of Fair Value Information for Financial Instruments (Details) - USD ($)
$ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Loans receivable, net |
$ 82,886
|
$ 71,895
|
| Revolving Credit Facility, net |
111,997
|
87,718
|
| Convertible Notes, net |
761,440
|
784,175
|
| Term Loan |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Term Loan, net |
0
|
428,441
|
| Senior Unsecured Notes |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Senior Unsecured Notes/ Mortgages and notes payable, net |
299,049
|
283,473
|
| Mortgages and Notes Payable |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Senior Unsecured Notes/ Mortgages and notes payable, net |
2,657,599
|
2,282,142
|
| Carrying Value |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Loans receivable, net |
79,967
|
66,578
|
| Revolving Credit Facility, net |
112,000
|
86,000
|
| Convertible Notes, net |
715,881
|
702,642
|
| Carrying Value | Term Loan |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Term Loan, net |
0
|
418,471
|
| Carrying Value | Senior Unsecured Notes |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Senior Unsecured Notes/ Mortgages and notes payable, net |
295,321
|
295,112
|
| Carrying Value | Mortgages and Notes Payable |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Senior Unsecured Notes/ Mortgages and notes payable, net |
$ 2,516,478
|
$ 2,162,403
|