Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Land	$ 26,770	$ 26,770
Buildings and improvements	132,529	131,174
Furniture and equipment	109,802	107,288
Capitalized software	178,113	162,065
Leasehold improvements	9,109	8,991
Fixed assets, gross	456,323	436,288
Less accumulated depreciation and amortization	(299,192)	(277,312)
Fixed assets, net	157,131	158,976
Depreciation expense	$ 20,500	$ 22,100	$ 24,600