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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Shares issued pursuant to equity incentive plan	27,592,000	22,536,000
Accrued distributions payable	$ 1,657	$ 2,853	$ 2,875
Accrued but unpaid distribution	60	20
Prepaid expenses and other assets			75
Accrued share based compensation	169	169
Accounts payable and accrued expenses	$ 806	$ 430

Carrying amount as of the balance sheet date of amounts paid for royalties in advance of when the expense is to be recognized, which will occur within one year or in the normal operating cycle, if longer.

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