Share-Based Awards (Narrative) (Details) - 2014 Plan shares in Millions	12 Months Ended
Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for future issuance under the plan	8.7
Performance Restricted Units (PRSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period (in years)	3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Restricted Stock \| First vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Restricted Stock \| Second vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Restricted Stock \| Third vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Restricted Stock Units (RSUs) \| First vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Restricted Stock Units (RSUs) \| Second vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Restricted Stock Units (RSUs) \| Third vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Expiration period (in years)	10 years
Stock Options \| First vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Stock Options \| Second vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Stock Options \| Third vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Expiration period (in years)	10 years
Stock Appreciation Rights (SARs) \| First vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Stock Appreciation Rights (SARs) \| Second vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%
Stock Appreciation Rights (SARs) \| Third vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting (as a percent)	33.33%

Share-based Compensation Arrangement by Share-based Payment Award, Performance Period

No definition available.

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- Definition

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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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

Period from grant date that an equity-based award expires, 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
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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