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Stock Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,631 $ 3,545 $ 6,949 $ 10,152 [1]
Number of shares authorized for grant 4,000,000   4,000,000  
Number of shares available for grant 3,000,000   3,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term     10 years  
Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards vesting period, (in years)     1 year  
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards vesting period, (in years)     4 years  
[1] See Note 2 - Restatement of Consolidated Financial Statements.