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 aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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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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Composition Of Certain Financial Statement Captions - Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 57,959		$ 57,959		$ 56,020
Less: accumulated depreciation and amortization	(24,975)		(24,975)		(21,578)
Property and equipment, net	32,984		32,984		34,442
Depreciation and amortization of property and equipment	1,700	$ 1,800	3,400	$ 3,600
Equipment, furniture and other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	27,964		27,964		26,029
Building and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,258		18,258		18,222
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,300		5,300		5,300
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,437		$ 6,437		$ 6,469