Real Estate (New Real Estate Investments) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) properties	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Payments to Acquire Real Estate	$ 157,214,000	$ 359,257,000	$ 106,315,000
Ensign Group [Member]
Payments to Acquire Real Estate	13,846,000
Real Estate Investments During The Period	$ 15,096,000
Real Estate Properties, Number Acquired | properties	1
Navion Senior Solutions [Member]
Real Estate Investments During The Period	$ 16,100,000
Real Estate Properties, Number Acquired | properties	3
Bickford Senior Living [Member]
Number of Real Estate Properties To Be Constructed | properties	2
Real Estate Properties, Number Acquired | properties	1
Acadia Healthcare [Member]
Real Estate Properties, Number Acquired | properties	1
Senior Living Communities [Member]
Real Estate Properties, Number Acquired | properties	1
Village Concepts [Member]
Real Estate Properties, Number Acquired | properties	1
Discovery Senior Living [Member]
Real Estate Properties, Number Acquired | properties	1
Prestige Senior Living [Member]
Payments to Acquire Real Estate	$ 26,200,000
Real Estate Investments During The Period	$ 26,200,000
Real Estate Properties, Number Acquired | properties	1
Real Estate Acquisition [Member]
Real Estate Investments During The Period	$ 191,231,000
Real Estate Acquisition [Member] | Navion Senior Solutions [Member]
Real Estate Investments During The Period	$ 8,200,000
Real Estate Properties, Number Acquired | properties	1
Real Estate Acquisition [Member] | Bickford Senior Living [Member]
Real Estate Investments During The Period	$ 10,400,000
Real Estate Acquisition [Member] | Acadia Healthcare [Member]
Real Estate Investments During The Period	4,840,000
Real Estate Acquisition [Member] | Senior Living Communities [Member]
Real Estate Investments During The Period	6,830,000
Real Estate Acquisition [Member] | Village Concepts [Member]
Real Estate Investments During The Period	7,100,000
Real Estate Acquisition [Member] | Discovery Senior Living [Member]
Real Estate Investments During The Period	$ 34,600,000