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Noncontrolling Interests on the Company's Consolidated Financial Statements (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Noncontrolling Interest [Abstract]
Percentage of general partnership interest owned by the company in the Operating Partnership	98.00%	98.00%	97.90%
Percentage of Common limited partnership interest owned by certain non-affiliated investors and certain directors and officers of the Company in the Operating Partnership	2.00%	2.00%	2.10%
Common units outstanding held by common limited partners	1,793,170	1,804,200	1,804,200
Common stock, par value	$ 0.01
Aggregate value upon redemption of outstanding noncontrolling common units	$ 137,900,000	$ 126,800,000
Noncontrolling Interest in Variable Interest Entity	$ 5,862,000	$ 5,862,000

The fair value as of the reporting date of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form.

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