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Summary Of Significant Accounting Policies - Estimated Useful Lives Of Assets (Details)	12 Months Ended
	Dec. 31, 2018
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	Up to 30 years
Property, plant and equipment, estimated useful lives	30 years
Building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	Up to 15 years
Property, plant and equipment, estimated useful lives	15 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	Lesser of useful life or term of lease
Equipment and furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	5 years
Operating lease assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	Greater of lease term or 1 to 5 years
Operating lease assets | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	5 years
Operating lease assets | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	1 year
Computer and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	3 years
Enterprise-wide software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	5 years
Purchased software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	Lesser of 3 years or life of license
Property, plant and equipment, estimated useful lives	3 years

X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223

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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.

+ Details

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- Definition

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.

+ References

No definition available.

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