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Stock Plans (Restricted Stock Unit Awards Activity) (Details) - Unvested restricted stock unit awards - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Shares    
Nonvested at December 31, 2017 2,650  
Granted 1,544 1,796
Released (570)  
Vested with deferred settlement (45)  
Forfeited (821)  
Nonvested at December 31, 2018 2,758 2,650
Weighted Average Grant Date Fair Value    
Nonvested at December 31, 2017 $ 6.16  
Granted 6.12 $ 5.89
Released 5.92  
Vested with deferred settlement 5.64  
Forfeited 6.22  
Nonvested at December 31, 2018 $ 6.18 $ 6.16