Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 01, 2019	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Overstatement of previously recorded tax benefits, deferred tax assets and net income					$ 800	$ 300	$ 200
Remaining lease term			5 years 6 months
Bad debt expense			$ 792	$ 2,719
Assets held for sale		$ 10,784	$ 10,784					$ 70,839
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Written off accounts receivable	$ 100
Straight-line rents receivable	$ 100
Minimum
Lessee, Lease, Description [Line Items]
Lease intangibles, lease-up period			6 months
Maximum
Lessee, Lease, Description [Line Items]
Lease intangibles, lease-up period			24 months
Credit Facility | Revolving Credit Facility
Lessee, Lease, Description [Line Items]
Increase in line of credit facility		$ 95,000
Building
Lessee, Lease, Description [Line Items]
Property, plant and equipment, useful life			40 years
Land Improvements
Lessee, Lease, Description [Line Items]
Property, plant and equipment, useful life			15 years
Furniture and Fixtures | Minimum
Lessee, Lease, Description [Line Items]
Property, plant and equipment, useful life			7 years
Furniture and Fixtures | Maximum
Lessee, Lease, Description [Line Items]
Property, plant and equipment, useful life			10 years
Seniors Housing Communities
Lessee, Lease, Description [Line Items]
Ancillary revenue			$ 3,800