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Stockholders' Equity (Schedule of Option Activity Under Stock Plans) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Stock Options      
Stock options issued and outstanding 983    
Common stock options      
Number of Stock Options      
Stock options issued and outstanding 975    
Granted 330    
Exercised (69)    
Cancelled (253)    
Stock options issued and outstanding 983 975  
Options vested and expected to vest 931    
Options exercisable 405    
Weighted Average Exercise Price      
Weighted-average exercise price, balance outstanding $ 18.14    
Granted 16.95    
Exercised 14.96    
Cancelled 20.43    
Weighted-average exercise price, balance outstanding 17.38 $ 18.14  
Weighted-average exercise price, vested and expected to vest 17.44    
Weighted-average exercise price, exercisable $ 20.34    
Weighted-average remaining contractual life (years), balance outstanding 4 years 6 months 25 days 3 years 6 months 6 days  
Weighted-average remaining contractual life (years), vested and expected to Vest 4 years 5 months 23 days    
Weighted-average remaining contractual life (years), exercisable 2 years 6 months 23 days    
Aggregate intrinsic value, balance outstanding $ 2,522 $ 31  
Aggregate intrinsic value, vested and expected to vest 2,401    
Aggregate intrinsic value, exercisable $ 857    
Weighted average fair value of options granted $ 9.03 $ 4.46 $ 5.67
Total fair value of options vested $ 799 $ 1,243 $ 1,602
Intrinsic value of options exercised $ 430 $ 4 $ 546