Schedule III Real Estate Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]
Real Estate, Gross	$ 7,031,660us-gaap_RealEstateGrossAtCarryingValue	$ 6,708,250us-gaap_RealEstateGrossAtCarryingValue	$ 6,038,107us-gaap_RealEstateGrossAtCarryingValue
Real Estate, Other Acquisitions	117,981us-gaap_RealEstateOtherAcquisitions	474,213us-gaap_RealEstateOtherAcquisitions	658,917us-gaap_RealEstateOtherAcquisitions
Real Estate, Improvements	592,651us-gaap_RealEstateImprovements	498,097us-gaap_RealEstateImprovements	211,460us-gaap_RealEstateImprovements
Real Estate, Other Additions	0us-gaap_RealEstateOtherAdditions	14,081us-gaap_RealEstateOtherAdditions	0us-gaap_RealEstateOtherAdditions
Real Estate, Cost of Real Estate Sold	(350,698)us-gaap_RealEstateCostOfRealEstateSold	(591,966)us-gaap_RealEstateCostOfRealEstateSold	(157,630)us-gaap_RealEstateCostOfRealEstateSold
Impairment Charges	(15,406)	0	0
Write Off of Fully Depreciated Assets	(70,340)us-gaap_RealEstateOtherDeductions	(71,015)us-gaap_RealEstateOtherDeductions	(42,604)us-gaap_RealEstateOtherDeductions
SEC Schedule III, Real Estate, Gross	7,305,848us-gaap_RealEstateGrossAtCarryingValue	7,031,660us-gaap_RealEstateGrossAtCarryingValue	6,708,250us-gaap_RealEstateGrossAtCarryingValue
Total Land, Land Improvements, Buildings and Tenant Improvements Held-for-Sale	(74,396)	(61,927)	(25,283)
Schedule III - Accumulated Depreciation of Assets Held-for-Sale	(24,552)	(14,351)	(289)
SEC Schedule III, Real Estate, Excluding Held-for-Sale	7,231,452	6,969,733	6,682,967
Real Estate Accumulated Depreciation	1,505,677	1,382,757	1,296,685	1,127,595
Real Estate Accumulated Depreciation, Depreciation Expense	290,279	288,583	262,825
Real Estate Accumulated Depreciation, Real Estate Sold	(97,032)	(131,496)	(51,131)
Real Estate Accumulated Depreciation, Other Deductions	(70,327)	(71,015)	(42,604)
Real Estate Investment Property, Accumulated Depreciation	$ 1,481,125	$ 1,368,406	$ 1,296,396

Schedule III - Accumulated Depreciation of Assets Held-for-Sale

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Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate and excludes held-for-sale properties.

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Total Land, Land Improvements, Buildings and Tenant Improvements Held-for-Sale

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Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of other deductions to accumulated depreciation, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of decrease to accumulated depreciation for real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of other additions excluding acquisition or improvement to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of other deductions to real estate investments, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of depreciation expense of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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