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Non-controlling Interests
9 Months Ended
Sep. 30, 2013
Noncontrolling Interest [Abstract]  
Non-controlling Interests
Non-controlling Interests
Operating Partnership 
Non-controlling interests represent the aggregate limited partnership interests in the Operating Partnership held by limited partners, other than the Company. Income (loss) attributable to the non-controlling interests is based on the limited partners' ownership percentage of the Operating Partnership. Income (loss) allocated to the Operating Partnership non-controlling interests for the three and nine months ended September 30, 2013 was an immaterial amount.