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Certain provisions of the partnership agreement 1 (Details) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Distribution Made to Member or Limited Partner [Line Items]
Basic and diluted common units	$ (0.06)	$ (0.02)
Common Stock [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distributed earning allocated to:	$ 5,707	$ 5,209
Undistributed loss allocated to:	(8,513)	(6,016)
Net Loss allocated to:	(2,806)	(807)
Restricted Stock Units (RSUs) [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distributed earning allocated to:	138	158
Undistributed loss allocated to:	(268)	(176)
Net Loss allocated to:	(130)	(18)
Total [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distributed earning allocated to:	5,845	5,367
Undistributed loss allocated to:	(8,781)	(6,192)
Net Loss allocated to:	$ (2,936)	$ (825)

The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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