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Summary of Significant Accounting Policies (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income taxes
Provision for state income taxes	$ 0.1		$ 0.1
Corporate income tax (as a percent)	6.00%
Segments
Number of reportable segments	1
LLC Subsidiaries
Income taxes
Provision for federal income taxes	0	0	0
Provision for state income taxes	$ 0	$ 0

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.