Investments In Direct Financing Lease (Summary Of Carrying Amounts Of Investment In Direct Financing Lease, Net) (Details) $ in Thousands		9 Months Ended
		Sep. 30, 2018 USD ($) years	Jul. 26, 2018 USD ($)	Dec. 31, 2017 USD ($)
Total minimum lease payments receivable		$ 36,907		$ 112,411
Estimated unguaranteed residual value of leased assets		16,509		47,000
Less deferred income	[1]	(32,921)		(101,508)
Investment in direct financing leases, net		20,495	$ 37,900	57,903
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs		$ 300		$ 800
Minimum [Member]
Length of lease (in years) | years		13
Maximum [Member]
Length of lease (in years) | years		14

[1] Deferred income is net of $0.3 million and $0.8 million of initial direct costs at September 30, 2018 and December 31, 2017, respectively.