Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Intangible Assets, (including Goodwill)
Goodwill	$ 2,367,228		$ 2,367,228		$ 1,642,083
Total identifiable intangibles	258,640		258,640		72,519
Amortized intangible assets:
Amortization expense	3,000	$ 200	4,400	$ 400
Trademarks
Intangible Assets, (including Goodwill)
Total identifiable intangibles	140,709		$ 140,709		57,709
Weighted average time until next renewal			4 years 1 month 6 days
Certificates of need
Intangible Assets, (including Goodwill)
Total identifiable intangibles	12,983		$ 12,983		12,727
Accreditations
Intangible Assets, (including Goodwill)
Total identifiable intangibles	2,083		$ 2,083		$ 2,083
Weighted average time until next renewal			1 year 6 months
Customer relationships
Intangible Assets, (including Goodwill)
Total identifiable intangibles	$ 102,865		$ 102,865