Property Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Furniture and equipment	$ 359,982,000	$ 332,607,000
Transportation equipment	11,451,000	11,957,000
Building and leasehold improvements	314,343,000	325,597,000
Land and land improvements	6,853,000	6,853,000
Construction in progress	80,683,000	93,419,000
Property assets, gross	773,312,000	770,433,000
Accumulated depreciation	(440,586,000)	(433,935,000)
Property assets, net	332,726,000	336,498,000
Capitalized software costs included in construction in progress	73,400,000	86,300,000
Cost of internally developed software placed in service	$ 51,600,000	$ 4,600,000	$ 8,400,000