Real Estate Leases - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 agreement	Dec. 31, 2012
Concentration Risk [Line Items]
Proceeds from sale of cost method investment in real estate	$ 96.7	$ 134.6
Number Of Property Operating Agreements	5
Approximate Investment in real estate properties subject to outstanding contractual option to purchase	$ 224.0
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Baylor Health System [Member]
Concentration Risk [Line Items]
Number of customer account for 10% or more of company's revenues including revenue from discontinued operations	1	0
Concentration Risk, Percentage	11.00%