Basis of Presentation and Significant Accounting Policies (Summary of Components of Net Operating Revenues Before Provision for Bad Debts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Health Care Organizations [Abstract]
Operating revenues	$ 3,068,323	$ 3,080,653
Less: Contractual allowances	(2,371,292)	(2,361,035)
Less: Discounts	(109,086)	(105,134)
Total net operating revenues, before the provision for bad debts	$ 587,945	$ 614,484