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Stockholders' Equity Stockholders' Equity (Status of stock based compensation plans) (Details) - shares
shares in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding (in shares) 1,650 1,695 1,381 766
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 5,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,126      
Options Outstanding (in shares) 1,650