Related Party Transactions (Schedule of Fees Earned from Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Management Fees [Member]
Revenue from related party transactions	$ 11,018	$ 10,090	$ 7,620
Leasing Fees [Member]
Revenue from related party transactions	3,411	4,417	2,700
Construction and Development Fees [Member]
Revenue from related party transactions	$ 4,739	$ 6,711	$ 10,257

- 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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