Commitments And Contingencies (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Guarantor Obligations [Line Items]
Maximum potential future undiscounted rental payments	$ 13,800,000	$ 13,800,000
Guarantor Obligations, Payments Made	$ 0
Guarantor Obligations, Expected Future Payments		$ 0
Property Lease Guarantee [Member]
Guarantor Obligations [Line Items]
Property leases	27	27
Property leases, still in operation	1	1
Primary Lessee [Member]
Guarantor Obligations [Line Items]
Property leases	5	5