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Significant Accounting Policies (Details 4) (Acquired unfavorable real estate leases, USD $)	12 Months Ended
	Dec. 31, 2011 M	Dec. 31, 2010	Dec. 31, 2009
Acquired unfavorable real estate leases
Acquired Unfavorable Real Estate Leases and Amortization
Minimum term of lease (in months)	23
Maximum term of lease (in months)	281
Amortization	$ 1,301,000	$ 1,147,000	$ 992,000
Estimated annual amortization for succeeding five years
2012	1,454,000
2013	1,357,000
2014	1,235,000
2015	1,182,000
2016	809,000
2017 and thereafter	$ 1,581,000

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The amount of amortization income expected to be recognized for the remainder of the finite-lived intangible asset useful life after the fifth succeeding fiscal year.

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