Related Party Transactions (Schedule of Fees Earned from Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Management Fees [Member]
Revenue from related party transactions	$ 2,117	$ 2,170	$ 4,336	$ 4,626
Leasing Fees [Member]
Revenue from related party transactions	2,169	568	2,513	1,122
Construction and Development Fees [Member]
Revenue from related party transactions	$ 2,417	$ 1,510	$ 3,382	$ 2,577

- 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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