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Significant Accounting Policies (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012 item	Dec. 31, 2011 item
Acquired Unfavorable Real Estate Leases and Amortization
Number of acquisitions of properties with leases	3	2	5
Acquired unfavorable real estate leases
Acquired Unfavorable Real Estate Leases and Amortization
Amortization	$ 3,073,000	$ 1,548,000	$ 1,301,000
Estimated annual amortization for succeeding five years
2014	3,267,000
2015	2,948,000
2016	2,387,000
2017	1,816,000
2018	1,397,000
2019 and thereafter	$ 2,360,000
Acquired unfavorable real estate leases | Minimum
Acquired Unfavorable Real Estate Leases and Amortization
Term of lease	2 months
Acquired unfavorable real estate leases | Maximum
Acquired Unfavorable Real Estate Leases and Amortization
Term of lease	281 months

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Represents the useful life of a major finite-lived intangible liability class.

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Represents the number of direct acquisitions of properties with leases.

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

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

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

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

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

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

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