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Share-Based Awards (Narrative) (Details) - 2014 Plan - shares shares in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2014 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares of common stock reserved for future issuance under the plan |  | 10.8
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%

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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