Land, Buildings And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 852,072	$ 886,740
Less accumulated depreciation and amortization	516,962	549,035
Net land, buildings and equipment	335,110	337,705
Depreciation expense	29,100	30,100	$ 30,100
Repairs and maintenance expense	16,400	16,200	16,300
Interest Expense Capitalized on Construction Projects	0	0	$ 0
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	94,992	98,221
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	540,204	530,489
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 216,876	$ 258,030