Goodwill And Intangible Assets (Summary Of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]
Non-amortizable intangible assets	$ 236,995	$ 236,995
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,468,789	1,462,706
Accumulated Amortization	(125,447)	(105,064)
Net	1,343,342	1,357,642
Total intangible assets, gross carrying amount	1,705,784	1,699,701
Accumulated Amortization	(125,447)	(105,064)
Total intangible assets, net	1,580,337	1,594,637
Trade name [Member]
Indefinite-lived Intangible Assets [Line Items]
Non-amortizable intangible assets	228,000	228,000
Restrictive covenant arrangements [Member]
Indefinite-lived Intangible Assets [Line Items]
Non-amortizable intangible assets	8,995	8,995
Customer relationships with hospitals [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,381,477	1,379,977
Accumulated Amortization	(91,744)	(74,490)
Net	1,289,733	1,305,487
Accumulated Amortization	(91,744)	(74,490)
Capitalized software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	76,029	71,462
Accumulated Amortization	(30,742)	(28,125)
Net	45,287	43,337
Accumulated Amortization	(30,742)	(28,125)
Agreements, contracts, and other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,283	11,267
Accumulated Amortization	(2,961)	(2,449)
Net	8,322	8,818
Accumulated Amortization	$ (2,961)	$ (2,449)