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Summary of Significant Accounting Policies (Real Estate Assets) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items] |  |  |
Net amortization expense of acquired intangibles | $ 19,030 | $ 10,558 | $ 7,108
Future amortization expense, 2014 | 13,421 |  |
Future amortization expense, 2015 | 10,475 |  |
Future amortization expense, 2016 | 6,219 |  |
Future amortization expense, 2017 | 4,537 |  |
Future amortization expense, 2018 | 2,079 |  |
Interest expense capitalized | 4,889 | 2,671 | 4,955
Intangible lease assets and other assets [Member] | Intangible Leases, Acquired-in-Place, Market Adjustment [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 65,932 | 69,360 |
Intangible lease assets and liabilities, Accumulated Amortization | (41,230) | (37,454) |
Intangible lease assets and other assets [Member] | Intangible Leases, Acquired-in-Place [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 111,769 | 117,631 |
Intangible lease assets and liabilities, Accumulated Amortization | (60,243) | (46,767) |
Intangible lease assets and other assets [Member] | Intangible Leases, Tenant Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 27,381 | 27,880 |
Intangible lease assets and liabilities, Accumulated Amortization | (4,004) | (3,350) |
Accounts payable and accrued liabilities [Member] | Intangible Leases, Acquired-in-Place, Market Adjustment [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 101,901 | 104,012 |
Intangible lease assets and liabilities, Accumulated Amortization | $ (64,046) | $ (57,625) |
Buildings [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 40 years |  |
Certain Improvements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful lives, description | 10 to 20 |  |
Certain Improvements [Member] | Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 10 years |  |
Certain Improvements [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 20 years |  |
Equipment and Fixtures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful lives, description | 7 to 10 |  |
Equipment and Fixtures [Member] | Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 7 years |  |
Equipment and Fixtures [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 10 years |  |

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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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