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Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Increase (Decrease) in Temporary Equity [Roll Forward]        
Balance, December 31, 2012     $ 80,046  
Preferred distributions     (3,212)  
Redemption of preferred units     (62)  
Net income 1,606 1,611 3,212 3,281
Balance, June 30, 2013 $ 79,984   $ 79,984