Real Estate Property Investments (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Other real estate acquisitions
Consideration, Noncontrolling Interest		$ 27,432,000
Operating segment
Other real estate acquisitions
Consideration, Cash Paid		172,380,000
Consideration, Debt and Other Liabilities Assumed		35,120,000
Consideration, Noncontrolling Interest		27,432,000
Assets Acquired, Real Estate		184,564,000
Assets Acquired, Net Intangibles		50,368,000
Operating segment | Post-acute/skilled
Acquisition
Acquisition of facility	400,000
Land acquired (in acres)	38
Operating segment | Medical office
Other real estate acquisitions
Consideration, Cash Paid		157,556,000
Consideration, Debt and Other Liabilities Assumed		35,120,000
Consideration, Noncontrolling Interest		27,346,000
Assets Acquired, Real Estate		170,443,000
Assets Acquired, Net Intangibles		49,579,000
Operating segment | Life science
Other real estate acquisitions
Consideration, Cash Paid		7,964,000
Consideration, Noncontrolling Interest		86,000
Assets Acquired, Real Estate		7,580,000
Assets Acquired, Net Intangibles		470,000
Operating segment | Senior housing
Acquisition
Acquisition of facility	18,000,000
Price paid upon exercise of purchase option	16,000,000
Other real estate acquisitions
Consideration, Cash Paid		3,860,000
Assets Acquired, Real Estate		3,541,000
Assets Acquired, Net Intangibles		319,000
Operating segment | Hospital
Other real estate acquisitions
Consideration, Cash Paid		3,000,000
Assets Acquired, Real Estate		3,000,000
Operating segment | Senior housing, life science and medical office
Other real estate acquisitions
Payments to acquire productive assets	$ 123,000,000	$ 126,000,000