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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property and Equipment [Line Items]
Property and Equipment, gross	$ 502,338		$ 502,338		$ 484,069
Less: Accumulated depreciation	(352,293)		(352,293)		(338,206)
Property and Equipment, net	150,045		150,045		145,863
Depreciation expense	7,422	$ 7,138	14,753	$ 14,260
Buildings
Property and Equipment [Line Items]
Property and Equipment, gross	162,449		162,449		160,796
Equipment
Property and Equipment [Line Items]
Property and Equipment, gross	130,486		130,486		126,954
Land
Property and Equipment [Line Items]
Property and Equipment, gross	10,772		10,772		10,772
Purchased software
Property and Equipment [Line Items]
Property and Equipment, gross	140,887		140,887		139,245
Furniture and fixtures
Property and Equipment [Line Items]
Property and Equipment, gross	18,429		18,429		18,103
Leasehold improvements
Property and Equipment [Line Items]
Property and Equipment, gross	20,024		20,024		18,959
Construction in progress
Property and Equipment [Line Items]
Property and Equipment, gross	$ 19,291		$ 19,291		$ 9,240

X

- Definition

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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- Definition

The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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- Definition

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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- Definition

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.

+ References

No definition available.

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