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Fair Value Measurements - Summary of Fair Value Information for Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Carrying Value [Member] | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Loans receivable, net | $ 109,425 | $ 117,721 |
| Revolving credit facilities | 15,181 | 35,120 |
| Convertible Notes, net (1) | 695,957 | 0 |
| Mortgages and notes payable | 3,658,496 | 3,743,098 |
| Estimated Fair Value [Member] | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Loans receivable, net | 115,747 | 131,587 |
| Revolving credit facilities | 15,254 | 34,911 |
| Convertible Notes, net (1) | 729,231 | 0 |
| Mortgages and notes payable | $ 3,899,950 | $ 3,892,621 |