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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 ATRIA Senior Living management fee	Dec. 31, 2011 ATRIA Senior Living management fee	Dec. 31, 2013 Medical Office Buildings Sutter Health
Related party transaction
Property leased by related party (as a percent)			100.00%
Revenue from Related Parties			$ 2.1
Related party costs	$ 33.9	$ 20.2

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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