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Stock Plans (Textual) (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
share_based_compensation_plan
shares
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of active share-based compensation plans | share_based_compensation_plan 2    
Tax benefit associated with stock option exercises $ 1,400,000    
Tax benefit realized on stock-based compensation $ 0 $ 0 $ 0
Weighted average grant date fair value of stock options granted | $ / shares $ 3.34   $ 2.89
Number of stock options granted | shares 322,000 0  
Total intrinsic value of options exercised $ 16,000 $ 638,000 $ 18,000
Cash proceeds from options exercises $ 128,000    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of option vesting 1 year    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of option vesting 4 years    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost adjusted for estimated forfeitures $ 741,000    
Unrecognized compensation cost, weighted average recognition period 3 years 4 months    
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of option vesting 4 years    
Total unrecognized compensation cost adjusted for estimated forfeitures $ 2,400,000    
Unrecognized compensation cost, weighted average recognition period 1 year 8 months    
Fair value per unit | $ / shares   $ 14.21 $ 10.20
Service-based share awards vest date fair value $ 1,200,000 $ 1,200,000 $ 916,000
Number of shares granted | shares 0    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of option vesting 1 year    
Total unrecognized compensation cost adjusted for estimated forfeitures $ 2,900,000    
Unrecognized compensation cost, weighted average recognition period 2 years 6 months    
Fair value per unit | $ / shares $ 7.02 $ 12.63 $ 10.25
Service-based share awards vest date fair value $ 498,000 $ 631,000 $ 275,000
Number of shares granted | shares 829,000    
Number of unrestricted shares of common stock received upon vesting | shares 1    
Restricted Stock Units | Service-based restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of option vesting 4 years    
Restricted Stock Units | Performance-based restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value per unit | $ / shares $ 7.18 $ 10.85  
Number of shares granted | shares 215,000 50,000  
Restricted Stock Units | Market-condition restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of option vesting   3 years  
Fair value per unit | $ / shares   $ 7.71  
Number of shares granted | shares   70,000  
Employee stock purchase plan awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares included in equity incentive pool | shares 1,000,000    
Fair value per unit | $ / shares $ 1.86 $ 4.56 $ 2.45
Number of shares issued during period | shares 145,733 93,588  
Percentage of trading price of stock 85.00%    
Offering period under ESPP 6 months    
Percentage discount on the stock price 15.00%    
Intrinsic value of stock purchased pursuant to ESPP $ 210,000 $ 449,000 $ 33,000
Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares included in equity incentive pool | shares 3,750,000