Fixed Assets (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2017 USD ($) a	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Fixed assets, gross		$ 512,292	$ 485,746
Less: accumulated depreciation and amortization		(359,269)	(340,523)
Fixed assets, net		153,023	145,223
Depreciation expense		19,900	21,200	$ 20,300
Number of acres | a	6
Proceeds from sale of property	$ 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
Land [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross		18,144	18,152
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross		138,238	136,827
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross		123,021	118,647
Software Development [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross		222,903	202,488
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross		$ 9,986	$ 9,632