Fair Value Measurements - Schedule of Carrying Amount And Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Thousands |
Jun. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Carrying Value | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Loans receivable, net | $ 109,377 | $ 109,425 |
| Revolving Credit Facilities, net | 20,000 | 15,114 |
| Mortgages and notes payable, net | 3,291,679 | 3,629,998 |
| Convertible Notes, net | 684,066 | 678,190 |
| Estimated Fair Value | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Loans receivable, net | 115,735 | 115,747 |
| Revolving Credit Facilities, net | 19,405 | 15,254 |
| Mortgages and notes payable, net | 3,467,272 | 3,899,950 |
| Convertible Notes, net | $ 700,170 | $ 729,231 |