Commitments and Contingencies - (Summary of Insurance Reserves Related to Professional and General Liability Claims and Workers Compensation Claims) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Insurance reserves for professional and general liability, current receivable	$ 25,570	$ 17,580
Insurance reserve for workers' compensation liability, current receivable	4,486	4,863
Total self-insurance reserves, current receivable	30,056	22,443
Insurance reserves for professional and general liability, long-term receivable	56,515	59,652
Insurance reserve for workers' compensation liability, long-term receivable	17,979	15,958
Total self-insurance reserves, long-term receivable	74,494	75,610
Insurance reserves for professional and general liability, current liability	26,369	17,810
Insurance reserve for workers' compensation liability, current liability	6,558	6,599
Total self-insurance reserves, current liability	32,927	24,409
Insurance reserves for professional and general liability, long-term liability	76,062	74,194
Insurance reserve for workers' compensation liability, long-term liability	19,862	17,416
Total self-insurance reserves, long-term liability	95,924	91,610
Insurance Reserves Indemnified By CHS, Inc. [Member]
Loss Contingencies [Line Items]
Insurance reserves for professional and general liability, current receivable	25,570	17,580
Insurance reserve for workers' compensation liability, current receivable	4,486	4,863
Insurance reserves for professional and general liability, long-term receivable	56,515	59,652
Insurance reserve for workers' compensation liability, long-term receivable	17,979	15,958
Insurance reserves for professional and general liability, current liability	25,570	17,580
Insurance reserve for workers' compensation liability, current liability	4,486	4,863
Insurance reserves for professional and general liability, long-term liability	56,515	59,652
Insurance reserve for workers' compensation liability, long-term liability	17,979	15,958
All Other Self-insurance Reserves [Member]
Loss Contingencies [Line Items]
Insurance reserves for professional and general liability, current receivable	0	0
Insurance reserve for workers' compensation liability, current receivable	0	0
Insurance reserves for professional and general liability, long-term receivable	0	0
Insurance reserve for workers' compensation liability, long-term receivable	0	0
Insurance reserves for professional and general liability, current liability	799	230
Insurance reserve for workers' compensation liability, current liability	2,072	1,736
Insurance reserves for professional and general liability, long-term liability	19,547	14,542
Insurance reserve for workers' compensation liability, long-term liability	$ 1,883	$ 1,458