Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Supplemental cash flow information:
Interest paid, net of capitalized interest	$ 393,095	$ 359,483
Income taxes paid	4,808	4,282
Capitalized interest	5,995	8,185
Supplemental schedule of non-cash investing activities:
Accrued construction costs	46,104	28,933
Loan originated in connection with Brookdale Transaction		67,640
Real estate contributed to CCRC-JV		91,603
Settlement of loans receivable as consideration for real estate acquisition	346,745	32,000
Tenant funded tenant improvements owned by HCP	17,552
Supplemental schedule of non-cash financing activities:
Vesting of restricted stock units	382	575
Cancellation of restricted stock		(1)
Conversion of non-managing member units into common stock	2,454	73
Noncontrolling interest issued in connection with Brookdale Transaction		46,751
Noncontrolling interest and other liabilities, net assumed in connection with the RIDEA III acquisition	61,219
Noncontrolling interest issued in connection with real estate acquisition	3,885	6,321
Noncontrolling interest disposed in connection with real estate sales		1,671
Other liabilities assumed with real estate acquisitions	21,076	1,734
Unrealized (losses) on available-for-sale securities and derivatives designated as cash flow hedges, net	$ (647)	$ 1,824