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Stockholder's Equity (Schedule of Stock Plan Activity) (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award, Movement in Shares Available for Grant [Roll Forward]  
Shares available for grant December 31, 2018 (in shares) 512
2014 Equity Incentive Plan  
Share-based Compensation Arrangement by Share-based Payment Award, Movement in Shares Available for Grant [Roll Forward]  
Shares available for grant December 31, 2017 (in shares) 1,409 [1]
Restricted stock units granted (in shares) (827) [1],[2]
Options granted (in shares) (317) [1],[3]
Restricted stock units cancelled (in shares) 198 [1],[4]
Options cancelled (in shares) 49 [1]
Shares available for grant December 31, 2018 (in shares) 512 [1]
[1] Shares available for grant do not include treasury stock shares that could be granted if we determined to do so.
[2] Includes grants of restricted stock units with service, performance-based or market-based vesting criteria.
[3] Includes grants of stock options with service, performance-based or market-based vesting criteria.
[4] Includes cancelled restricted stock units with service, performance-based or market-based vesting criteria.