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Investments - Schedule of Lease Intangible Assets and Liabilities, Net of Accumulated Amortization (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
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Dec. 31, 2014
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|---|---|---|
| Capital Leased Assets [Line Items] | ||
| Less: accumulated amortization | $ (196,327) | $ (187,160) |
| Intangible lease assets, net | 573,925 | 590,073 |
| Less: accumulated amortization | (34,889) | (31,625) |
| Intangible lease liabilities, net | 204,161 | 205,968 |
| In-Place Leases | ||
| Capital Leased Assets [Line Items] | ||
| Intangible lease assets, gross | 670,127 | 676,665 |
| Above-Market Leases | ||
| Capital Leased Assets [Line Items] | ||
| Intangible lease assets, gross | 100,125 | 100,568 |
| Below-Market Leases | ||
| Capital Leased Assets [Line Items] | ||
| Intangible lease liabilities, gross | $ 239,050 | $ 237,593 |