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Stock Plans (Textual) (Details)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2014
$ / shares
Dec. 31, 2017
USD ($)
shares
share_based_compensation_plan
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
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 | $   $ 4,200    
Weighted average grant date fair value of stock options granted | $ / shares   $ 2.97   $ 3.34
Granted   50,000 0  
Total intrinsic value of options exercised | $     $ 16  
Number of stock options exercised   0 0  
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 | $   $ 300    
Unrecognized compensation cost, weighted average recognition period   1 year 1 month    
Unvested restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service-based share awards vest date fair value | $   $ 300 $ 600 $ 1,200
Amount of unrecognized compensation cost | $   $ 100    
Unrecognized compensation cost, weighted average recognition period   2 months    
Number of shares granted   0    
Unvested restricted stock unit awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period of option vesting   1 year    
Fair value per unit | $ / shares $ 7.02 $ 5.89 $ 6.00  
Service-based share awards vest date fair value | $   $ 2,900 $ 1,300 $ 500
Amount of unrecognized compensation cost | $   $ 8,300    
Unrecognized compensation cost, weighted average recognition period   2 years 2 months    
Number of shares granted   1,796,000    
Number of unrestricted shares of common stock received upon vesting   1    
Unvested restricted stock unit awards | Service-based        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period of option vesting   4 years    
Unvested restricted stock unit awards | Performance objectives        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value per unit | $ / shares   $ 5.73 $ 5.08 $ 7.18
Number of shares granted   158,000 46,224 214,831
Unvested restricted stock unit awards | Market-condition        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value per unit | $ / shares   $ 7.22 $ 7.76  
Number of shares granted   367,874 313,460 0
Unvested restricted stock unit awards | Market-condition | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential vesting percentage   0.00%    
Unvested restricted stock unit awards | Market-condition | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential vesting percentage   200.00%    
Market Condition Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period of option vesting   1 year    
Market Condition Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period of option vesting   2 years    
Market Condition Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period of option vesting   3 years    
Employee stock purchase plan awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares included in equity incentive pool   1,500,000    
Fair value per unit | $ / shares   $ 1.30 $ 1.93 $ 1.86
Number of shares issued during period   77,914 111,832 145,733
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 | $   $ 100 $ 100 $ 200
Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares included in equity incentive pool   6,400,000    
Deferred Compensation, Share-based Payments [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred Compensation Arrangement with Individual, Compensation Expense | $   $ 2,800 $ 1,400  
Annual Incentive Bonuses, 2016 Performance Period [Member] | Deferred Compensation, Share-based Payments [Member] | Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred Compensation Arrangement with Individual, Shares Issued   302,326    
Director [Member] | Deferred Compensation, Share-based Payments [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred Compensation Arrangement with Individual, Shares Issued   28,732    
Deferred Compensation Arrangement with Individual, Compensation Expense | $   $ 258    
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued | $   $ 164