Non-controlling Interests (Details) (USD $)	1 Months Ended		3 Months Ended		6 Months Ended				1 Months Ended	3 Months Ended		6 Months Ended				1 Months Ended	3 Months Ended			6 Months Ended
	Apr. 19, 2007	Apr. 30, 2007 Director Subclasses	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Apr. 20, 2007	Apr. 11, 2007	Apr. 30, 2007 Class A Membership Unit [Member] Director	Jun. 30, 2014 Class A Membership Unit [Member]	Jun. 30, 2013 Class A Membership Unit [Member]	Jun. 30, 2014 Class A Membership Unit [Member]	Jun. 30, 2013 Class A Membership Unit [Member]	Mar. 31, 2014 Class A Membership Unit [Member]	Apr. 20, 2007 Class A Membership Unit [Member]	Apr. 30, 2007 Class B Membership Unit [Member] Director	Jun. 30, 2014 Class B Membership Unit [Member]	Mar. 31, 2014 Class B Membership Unit [Member] Director Subclasses	Jun. 30, 2013 Class B Membership Unit [Member]	Jun. 30, 2014 Class B Membership Unit [Member]	Jun. 30, 2013 Class B Membership Unit [Member]	Apr. 20, 2007 Class B Membership Unit [Member]	Apr. 19, 2007 Class B Membership Unit [Member]
Noncontrolling Interest [Line Items]
Net book value of assets contributed								$ 17,000
Percentage of membership interest owned before (in hundredths)	0.001%	99.999%
Owned membership interest from private equity investors (in hundredths)
Cash consideration received on sale of membership interest							6,000,000
Recognized gain on sale of membership interests to the Investors	5,800,000
Percentage of ownership interest owned after transaction (in hundredths)		60.00%							60.00%							40.00%
Number of members in board of director		5
Number of subclasses of membership units		2
Percentage of profit and loss allocated (in hundredths)															60.00%							40.00%
Net (loss) income			(4,003,000)	1,070,000	(9,304,000)	414,000				0.5	1.0	0.9	1.4				343,000		616,000	601,000	960,000
Number of directors entitled to appoint									3							2
Changes in non-controlling interest [Abstract]
Non-controlling interest, beginning of period			264,000	351,000	454,000	468,000
Percentage of membership interest sold to investor (in hundredths)							39.999%
Net income			343,000	616,000	601,000	960,000
Distributions			(257,000)	(344,000)	(705,000)	(805,000)											257,000		344,000	705,000	805,000
Non-controlling interest, end of period			$ 350,000	$ 623,000	$ 350,000	$ 623,000