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Investments - Narrative (Details) (USD $)
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9 Months Ended | |||||||
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Sep. 30, 2014
Property
State
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Dec. 31, 2013
Property
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| Investment [Line Items] | ||||||||
| Real estate properties and loans, gross | $ 7,705,490,000 | [1] | $ 7,235,732,000 | [1] | ||||
| Real estate assets held for sale | 2,408 | 2,186 | ||||||
| Properties dispersed geographically | 49 | |||||||
| Minimum percentage of investment in real estate properties | 10.00% | |||||||
| Number of owned real estate properties | 2,263 | 2,041 | ||||||
| Securing mortgage properties | 145 | 145 | ||||||
| Securing mortgage properties carrying amount | 111,000,000 | 117,300,000 | ||||||
| Other loan receivable with aggregate carrying value | 400,000 | 400,000 | ||||||
| Accumulated depreciation and amortization associated with dispositions of real estate | 6,700,000 | |||||||
| Number of real estate properties held for sale | 20 | [2] | 11 | |||||
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Properties Vacant
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| Investment [Line Items] | ||||||||
| Number of properties | 40 | 21 | ||||||
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Property Held For Sale
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| Investment [Line Items] | ||||||||
| Number of properties | 7 | 6 | ||||||
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Texas
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| Investment [Line Items] | ||||||||
| Number of states exceeding disclosure threshold | 1 | |||||||
| Percentage of investment in real estate properties | 12.90% | |||||||
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Continuing operations
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| Investment [Line Items] | ||||||||
| Number of real estate properties held for sale | 15 | |||||||
| Rental properties | $ 44,600,000 | |||||||
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