Fixed Assets (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2017 USD ($) a	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Property, Plant and Equipment [Abstract]
Land		$ 18,152	$ 26,770
Buildings and improvements		136,827	134,952
Furniture and equipment		118,647	114,156
Capitalized software		202,488	190,092
Leasehold improvements		9,632	9,369
Fixed assets, gross		485,746	475,339
Less accumulated depreciation and amortization		(340,523)	(319,429)
Fixed assets, net		145,223	155,910
Depreciation expense		$ 21,100	$ 20,200	$ 20,500
Number of acres | a	6
Proceeds from Sale of Property, Plant, and Equipment	$ 12,200
Promissory note received in sale of land	$ 5,700
Interest rate on promissory note	3.50%
Gain on sale of land	$ 3,300