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Investments - Schedule of Minimum Future Contractual Rent to be Received (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
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|---|---|
| Investments in and Advances to Affiliates, Schedule of Investments [Abstract] | |
| Remainder of 2015 | $ 459,105 |
| 2016 | 600,209 |
| 2017 | 585,456 |
| 2018 | 570,474 |
| 2019 | 550,798 |
| Thereafter | 4,320,779 |
| Total future minimum rentals | $ 7,086,821 |