Summary of Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue Recognition
Operating funding source through Medicaid reimbursement (as a percent)	68.00%	66.00%	66.00%
Operating funding source from the DOL (as a percent)	7.00%	8.00%	8.00%
Operating funding source percentage from other payors	25.00%	26.00%	26.00%