Property Assets Property Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Assets [Abstract]
Furniture and equipment	$ 511,527,000	$ 522,036,000
Transportation equipment	10,585,000	11,854,000
Building and leasehold improvements	269,522,000	274,118,000
Land and land improvements	6,747,000	6,747,000
Construction in progress	10,193,000	23,774,000
Total property assets	808,574,000	838,529,000
Accumulated depreciation of property assets	(525,673,000)	(522,101,000)
Property assets, net of accumulated depreciation of $525,673 and $522,101 in 2017 and 2016, respectively	282,901,000	316,428,000
Capitalized software costs included in construction in progress	7,300,000	22,900,000
Cost of internally developed software placed in service	$ 32,100,000	$ 84,500,000	$ 22,900,000