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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 and Equipment [Line Items]
Property and Equipment, gross	$ 468,322		$ 468,322		$ 456,383
Less: Accumulated depreciation	(323,992)		(323,992)		(309,955)
Property and Equipment, net	144,330		144,330		146,428
Depreciation expense	7,138	$ 6,599	14,260	$ 13,399
Buildings
Property and Equipment [Line Items]
Property and Equipment, gross	154,305		154,305		153,961
Equipment
Property and Equipment [Line Items]
Property and Equipment, gross	121,442		121,442		115,546
Land
Property and Equipment [Line Items]
Property and Equipment, gross	10,557		10,557		10,030
Purchased software
Property and Equipment [Line Items]
Property and Equipment, gross	138,122		138,122		134,610
Furniture and fixtures
Property and Equipment [Line Items]
Property and Equipment, gross	18,007		18,007		18,114
Leasehold improvements
Property and Equipment [Line Items]
Property and Equipment, gross	18,464		18,464		18,017
Construction in progress
Property and Equipment [Line Items]
Property and Equipment, gross	$ 7,425		$ 7,425		$ 6,105

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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- Definition

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