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Noncontrolling Interests on the Company's Consolidated Financial Statements (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Noncontrolling Interest [Abstract]      
Percentage of general partnership interest owned by the company in the Operating Partnership 97.90% 97.80% 97.60%
Percentage of Common limited partnership interest owned by certain non-affiliated investors and certain directors and officers of the Company in the Operating Partnership 2.10% 2.20% 2.40%
Common units outstanding held by common limited partners 1,804,200 1,805,200 1,826,503
Common stock, par value $ 0.01    
Aggregate value upon redemption of outstanding noncontrolling common units $ 105,400,000 $ 90,800,000  
Noncontrolling Interest in Variable Interest Entity $ 4,885,000 $ 4,885,000