Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 24,493		$ 37,797
Less: Accumulated amortization	(20,886)		(30,428)
Net intangible assets other than goodwill	3,607	$ 3,827	7,369
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	14,973		28,592
Less: Accumulated amortization	(14,388)		(24,145)
Net intangible assets other than goodwill	585		4,447
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,258		7,254
Less: Accumulated amortization	(5,389)		(5,207)
Net intangible assets other than goodwill	1,869		2,047
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,262		1,951
Less: Accumulated amortization	(1,109)		(1,076)
Net intangible assets other than goodwill	$ 1,153		$ 875