Fixed Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Abstract]
Land	$ 26,770,000	$ 26,770,000
Buildings and improvements	126,726,000	125,837,000
Furniture and equipment	106,788,000	113,628,000
Capitalized software	133,477,000	123,356,000
Leasehold improvements	7,593,000	7,354,000
Fixed assets, gross	401,354,000	396,945,000
Less accumulated depreciation and amortization	(239,414,000)	(219,185,000)
Fixed assets, net	161,940,000	177,760,000
Depreciation expense	$ 30,800,000	$ 34,300,000	$ 33,900,000