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

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 270,866	$ 270,338
Less: accumulated depreciation and amortization	(183,919)	(175,903)
Property and equipment, net	86,947	94,435
Depreciation and amortization of property, equipment and software	33,293	33,254	$ 27,515
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	90,347	95,350
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,042	7,547
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,674	8,624
Building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,305	14,825
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,949	2,769
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,685	9,404
Capitalized software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 134,864	$ 131,819