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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 300,511	$ 244,064
Accumulated depreciation and amortization	(177,834)	(170,301)
Property and equipment, net	122,677	73,763
Leasehold improvements reimbursed by lessors as lease incentives	300	1,200
Fixed assets written off	$ 17,800	5,300
Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	3 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	40 years
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,138	7,138
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 20,883	20,739
Building and Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	5 years
Building and Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	40 years
Furniture and Office Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 76,856	76,726
Furniture and Office Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	5 years
Furniture and Office Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	7 years
Computer hardware
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 13,546	10,970
Computer hardware | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	3 years
Computer hardware | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	7 years
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 129,519	80,662
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	3 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	10 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 44,215	42,915
Leasehold Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	3 years
Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	10 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,354	$ 4,914

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Increase of leasehold improvements reimbursed by lessors during the period. These reimbursements were capitalized as leasehold improvements and a long-term liability established.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Name Accounting Standards Codification
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Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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