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Investments - Summary of Total Impairment Losses Recognized (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Investments in and Advances to Affiliates, Schedule of Investments [Abstract] | |||
| Real estate and intangible asset impairment | $ 40,728 | $ 6,829 | $ 10,923 |
| Loans and Leases Receivable, Impairments, Net | (4,820) | 487 | 2,809 |
| Write-off of lease intangibles due to lease terminations | 0 | (367) | (180) |
| Other impairment | 528 | 0 | 0 |
| Impairments | $ 36,436 | $ 6,949 | $ 13,552 |