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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%