Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance, December 31, 2012			$ 80,046
Distributions to preferred unitholders			(4,818)
Redemption of preferred units			(77)
Net income	1,606	1,609	4,818	4,890
Balance, September 30, 2013	$ 79,969		$ 79,969