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Significant Accounting Policies Revenue and Accounts Receivable (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Rate
Sep. 30, 2012
Rate
Sep. 30, 2013
Rate
Sep. 30, 2012
Rate
% of Revenue 100.00% 100.00% 100.00% 100.00%
Total Medicaid and Medicare
       
% of Revenue 71.20% 73.80% 72.20% 73.80%