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RELATED PARTY TRANSACTIONS (Details) (USD $)	12 Months Ended
RELATED PARTY TRANSACTIONS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Lead Trustee [Member]
Related Party Transaction [Line Items]
Related party transaction expense	$ 0	$ 100,000	$ 100,000
Core Portfolio [Member] \| Brandywine Portfolio [Member]
Related Party Transaction [Line Items]
Related party revenue	$ 200,000	$ 100,000	$ 800,000

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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