Property Assets Property Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Furniture and equipment	$ 475,431	$ 512,056
Building and leasehold improvements	207,620	251,975
Land and land improvements	0	6,737
Transportation equipment	567	3,765
Construction in progress	5,346	3,540
Total property assets	688,964	778,073
Accumulated depreciation of property assets	(522,826)	(551,750)
Property assets, net of accumulated depreciation of $522,826 and $551,750 in 2019 and 2018, respectively	166,138	226,323
Capitalized software costs included in construction in progress	3,800	1,900
Cost of internally developed software placed in service	6,000	9,700	$ 32,100
Proceeds from sale of corporate headquarters	43,200
Gain on sale of corporate headquarters	$ 21,800
Corporate headquarters lease terms	The lease includes an initial term of 12 years, with two five year renewal option periods at our discretion
Operating lease right-of-use assets	$ 281,566	$ 0
Corporate Headquarters [Member]
Property, Plant and Equipment [Line Items]
Operating lease right-of-use assets	19,000
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Write-off	14,000
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Write-off	$ 6,700