Contingencies and Other Commitments - Textual (Details)	12 Months Ended
	Dec. 31, 2004 USD ($)	Dec. 31, 1995	Dec. 31, 2015 USD ($)	Feb. 28, 2015	Apr. 24, 2014	Mar. 04, 2013
Loss Contingencies [Line Items]
Compliance Threshold Under Health Care Act			60.00%
Purchase Obligations, Due Within One Year			$ 33,300,000
Purchase Obligations, Due within Two Years			28,200,000
Purchase Obligations, Due Within Three Years			21,100,000
Purchase Obligations, Due Within Four Years			12,600,000
Purchase Obligations, Due Within Five Years			11,900,000
Purchase Obligations, Due After Five Years			$ 7,200,000
Litigation, General Medicine [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Time Period		3 years
Consent Judgment Awarded to Plaintiff	$ 376,000,000
Loss Contingency, Litigation Settlement, Consideration	$ 300,000
HHS-OIG Investigation [Member]
Loss Contingencies [Line Items]
Number of hospitals that received subpoenas					7	4
Number of patient medical records requested for each hospital in subpoenas						100
Number of hospitals that received supplemental subpoenas					2
Number of additional patient medical records requested				70
Compliance Threshold Under Health Care Act			60.00%