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Significant Accounting Policies (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 item | Dec. 31, 2012 item | Dec. 31, 2011 item
Acquired real estate leases and amortization |  |  |
Number of acquisitions of properties with leases | 3 | 2 | 5
Amortization expense | $ (365,000) | $ 71,000 | $ (47,000)
Acquired in-place and above market real estate leases |  |  |
Acquired real estate leases and amortization |  |  |
Amortization expense | 32,230,000 | 19,174,000 | 13,697,000
Estimated annual amortization for succeeding five years |  |  |
2014 | 42,243,000 |  |
2015 | 36,876,000 |  |
2016 | 30,807,000 |  |
2017 | 24,524,000 |  |
2018 | 19,369,000 |  |
2019 and thereafter | $ 29,635,000 |  |
Acquired in-place and above market real estate leases | Minimum |  |  |
Acquired real estate leases and amortization |  |  |
Term of lease | 1 month |  |
Acquired in-place and above market real estate leases | Maximum |  |  |
Acquired real estate leases and amortization |  |  |
Term of lease | 281 months |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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