Property and Equipment Used in Operations (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property and equipment used in operations
Total property and equipment	$ 261,542	$ 263,610
Less accumulated depreciation	(153,249)	(144,183)
Property and equipment, net	108,293	119,427
Land and improvements
Property and equipment used in operations
Total property and equipment	30,276	30,965
Building and improvements
Property and equipment used in operations
Total property and equipment	116,286	117,350
Furniture, fixtures, and equipment
Property and equipment used in operations
Total property and equipment	114,972	114,965
Construction in progress
Property and equipment used in operations
Total property and equipment	$ 8	$ 330