Basis of Presentation and Summary of Significant Accounting Policies - Acquisition of Real Estate Assets and Related Depreciation and Amortization (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Below-Market Lease Amounts [Line Items]
Below Market Lease, Net	$ 13,800,000us-gaap_BelowMarketLeaseNet	$ 16,900,000us-gaap_BelowMarketLeaseNet
Below Market Lease, Accumulated Amortization	39,000,000	35,900,000
Amortization of Below Market Lease	1,300,000us-gaap_AmortizationOfBelowMarketLease	2,900,000us-gaap_AmortizationOfBelowMarketLease	3,300,000us-gaap_AmortizationOfBelowMarketLease
Below Market Leases Written Off To Gain Loss Upon Sale	1,800,000		500,000
Schedule of expected amortization of below market obligations related to acquired leases
2015	(1,474,000)
2016	(1,329,000)
2017	(1,230,000)
2018	(1,112,000)
2019	$ (1,024,000)
Leases, Acquired-in-Place, Market Adjustment [Member]
Below-Market Lease Amounts [Line Items]
Weighted average amortization period of below market leases	7 years 0 months
Weighted Average [Member] \| Building and Building Improvements [Member]
Below-Market Lease Amounts [Line Items]
Weighted average depreciable life of acquired buildings and improvements	30 years

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Amount of acquired leases written of to gain loss as part of a real property disposition

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No definition available.

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

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No definition available.

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

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the fifth 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.

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No definition available.

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Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the fourth 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.

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No definition available.

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Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the third 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.

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No definition available.

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Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the second 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.

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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.

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No definition available.

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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.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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No definition available.

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