Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Land	$ 26,770	$ 26,770
Buildings and improvements	134,952	132,529
Furniture and equipment	114,156	109,802
Capitalized software	190,092	178,113
Leasehold improvements	9,369	9,109
Fixed assets, gross	475,339	456,323
Less accumulated depreciation and amortization	(319,429)	(299,192)
Fixed assets, net	155,910	157,131
Depreciation expense	$ 20,200	$ 20,500	$ 22,100