Employee Benefit Plans (Stock-Based Compensation Narrative) (Details) shares in Millions	12 Months Ended
Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserve for stock issuance (in shares)	2.9
Stock Incentive Plan 2007 (Amended and Restated Plan)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserve for stock issuance (in shares)	13.4
Minimum term of options granted	7 years
Maximum term of options granted	10 years
Percentage of increments vested	25.00%
Period of increments vested	4 years
Period of options granted to non-employee directors	10 years

Maximum term of options granted.

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Minimum term of options granted.

+ References

No definition available.

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- Definition

percentage of options vest per year.

+ References

No definition available.

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- Definition

Period of options granted to non-employee directors.

+ References

No definition available.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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