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Stockholders' Equity Stockholders' Equity (Status of stock based compensation plans) (Details) - shares
shares in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Capital Shares Reserved for Future Issuance 1,583      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,553      
Options Outstanding (in shares) 1,934 1,650 1,695 1,381
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 320      
Amended And Restated 2006 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Capital Shares Reserved for Future Issuance 0      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 0      
Options Outstanding (in shares) 1,918      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 311      
2017 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Capital Shares Reserved for Future Issuance 1,583      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,553      
Options Outstanding (in shares) 16      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 9