Land, Buildings And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 863,779	$ 852,072
Less accumulated depreciation and amortization	530,660	516,962
Net land, buildings and equipment	333,119	335,110
Depreciation expense	28,600	29,100	$ 30,100
Repairs and maintenance expense	16,900	16,400	16,200
Interest Expense Capitalized on Construction Projects	0	0	$ 0
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	91,603	94,992
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	545,510	540,204
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 226,666	$ 216,876