Property Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property Assets (Details) [Abstract]
Furniture and equipment	$ 332,607,000	$ 316,696,000
Transportation equipment	11,957,000	12,204,000
Building and leasehold improvements	325,597,000	311,782,000
Land and land improvements	6,853,000	5,299,000
Construction in progress	93,419,000	61,858,000
Property assets, gross	770,433,000	707,839,000
Accumulated depreciation	(433,935,000)	(398,039,000)
Property assets, net	336,498,000	309,800,000
Capitalized software costs included in construction in progress	86,300,000	54,800,000
Cost of internally developed software placed in service	$ 4,600,000	$ 8,400,000	$ 16,000,000