Deferred Financing and Leasing Costs Finite-Lived Intangible Assets (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Deferred financing costs, gross	$ 38,445,000us-gaap_DeferredFinanceCostsGross	$ 36,883,000us-gaap_DeferredFinanceCostsGross
Below Market Lease, Net	7,500,000us-gaap_BelowMarketLeaseNet	9,100,000us-gaap_BelowMarketLeaseNet
Amortization of above and below Market Leases	(2,800,000)	(290,000)	491,000
Above Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Amortization Period	3 years 2 months 0 days
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining Amortization Period	4 years 5 months 2 days
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 21,292,000

Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

No definition available.

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- Definition

Amount after amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

+ References

No definition available.

+ Details

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- Definition

For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

+ Details

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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- Definition

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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- Details

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