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Stock-based Compensation (Narrative) (Details) - shares
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Market-based awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted, Shares 56,571 79,153
Average period based on relative TSR 3 years  
Market-based awards | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance metric achieved 100.00%  
Performance And Market-Based Restricted Stock Units | Minimum [Member] | Senior management    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance metric, potential range 0.00%  
Performance And Market-Based Restricted Stock Units | Maximum [Member] | Senior management    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance metric, potential range 150.00%  
Market Based Awards That Achieved Payout In Excess Of 1[Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted, Shares 5,881 30,453
Performance-based restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted, Shares 0 1,949
Performance metric achieved 100.00%  
Performance-based restricted stock units | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance metric, potential range 0.00%  
Performance-based restricted stock units | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance metric, potential range 200.00%  
2014 Stock Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant 4,267,859  
ESPP Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant 2,397,260  
SIP Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant 689,062