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Impairment of Real Estate Investments	12 Months Ended
Impairment of Real Estate Investments	Dec. 31, 2015
Impairment of Real Estate [Abstract]
Impairment of Real Estate Investments	Impairment of Real Estate Investments The Company assesses on a regular basis whether there are any indicators that the carrying value of real estate assets may be impaired. Potential indicators may include an increase in vacancy at a property, tenant financial instability and the potential sale of the property in the near future. An asset is determined to be impaired if the asset's carrying value is in excess of its estimated fair value. During 2015, 2014 and 2013, the Company recognized aggregate impairment charges of $36,832, $34,833 and $21,640, respectively, on real estate assets classified in continuing operations. The Company determined that the expected undiscounted cash flows based upon revised estimated holding periods of certain assets were below the current carrying values. During 2014 and 2013, the Company recognized $13,767 and $12,920, respectively, of impairment charges in discontinued operations, relating to real estate assets that were ultimately disposed of below their carrying value.