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Stockholders' Equity Stockholders' Equity (Stock-Based Compensation Plans) (Details)
shares in Thousands
Mar. 31, 2018
shares
Class of Stock [Line Items]  
Shares Reserved (in shares) 1,768
Shares Available to Issue (in shares) 1,230
Options Outstanding (in shares) 1,864
Performance Awards Outstanding (in shares) 532
Amended And Restated 2006 Plan [Member]  
Class of Stock [Line Items]  
Shares Reserved (in shares) 0
Shares Available to Issue (in shares) 0
Options Outstanding (in shares) 1,641
Performance Awards Outstanding (in shares) 303
2017 Plan [Member]  
Class of Stock [Line Items]  
Shares Reserved (in shares) 1,768
Shares Available to Issue (in shares) 1,230
Options Outstanding (in shares) 223
Performance Awards Outstanding (in shares) 229