Real Estate Real Estate (Schedule of Tenant Purchase Options) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) properties
Number of Real Estate Properties	228
Medical Office Building [Member]
Number of Real Estate Properties	2
Senior Housing Community [Member]
Number of Real Estate Properties	151
Hospital [Member]
Number of Real Estate Properties	3
Skilled Nursing Facility [Member]
Number of Real Estate Properties	72
Open Now [Member] | Medical Office Building [Member] | February 2025 [Member]
Number of Real Estate Properties	1
Minimum Annual Lease Income | $	$ 306
Open Now [Member] | Senior Housing Community [Member] | September 2027 [Member]
Number of Real Estate Properties	4
Minimum Annual Lease Income | $	$ 1,560
2020 [Member] | Senior Housing Community [Member] | December 2024 [Member]
Number of Real Estate Properties	8
Minimum Annual Lease Income | $	$ 4,482
2020 [Member] | Hospital [Member] | September 2027 [Member]
Number of Real Estate Properties	1
Minimum Annual Lease Income | $	$ 2,713
2020 [Member] | Hospital [Member] | March 2025 [Member]
Number of Real Estate Properties	1
Minimum Annual Lease Income | $	$ 1,957
2021 [Member] | Senior Housing Community [Member] | May 2031 [Member]
Number of Real Estate Properties	2
Minimum Annual Lease Income | $	$ 4,949
2022 [Member] | Hospital [Member] | June 2022 [Member]
Number of Real Estate Properties	1
Minimum Annual Lease Income | $	$ 3,460
2025 [Member] | Skilled Nursing Facility [Member] | August 2028 [Member]
Number of Real Estate Properties	7
Minimum Annual Lease Income | $	$ 3,671
2028 [Member] | Skilled Nursing Facility [Member] | September 2028 [Member]
Number of Real Estate Properties	1
Minimum Annual Lease Income | $	$ 463