Related Party Transactions (Schedule of Fees Earned from Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Management Fees [Member]
Revenue from related party transactions	$ 2,246	$ 2,796	$ 6,872	$ 8,251
Leasing Fees [Member]
Revenue from related party transactions	310	622	1,432	2,856
Construction and Development Fees [Member]
Revenue from related party transactions	$ 681	$ 1,860	$ 3,258	$ 3,615

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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