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Stock Plans (Textual) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
share_based_compensation_plan
$ / shares
Dec. 31, 2017
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 | $ $ 4,800  
Weighted average grant date fair value of stock options granted | $ / shares $ 2.75 $ 2.97
Granted 30,000  
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  
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized compensation cost adjusted for estimated forfeitures | $ $ 100  
Unrecognized compensation cost, weighted average recognition period 5 months  
Unvested restricted stock awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Service-based share awards vest date fair value | $ $ 100 $ 300
Number of shares granted 0 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 $ 6.12 $ 5.89
Service-based share awards vest date fair value | $ $ 3,000 $ 2,900
Amount of unrecognized compensation cost | $ $ 8,300  
Unrecognized compensation cost, weighted average recognition period 2 years  
Number of shares granted 1,544,000 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  
Fair value per unit | $ / shares $ 5.70 $ 5.53
Number of shares granted 1,111,000 1,270,000
Unvested restricted stock unit awards | Market-condition    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value per unit | $ / shares $ 7.49 $ 7.22
Number of shares granted 355,000 368,000
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 | 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 | 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 | 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 $ 1.28 $ 1.30
Number of shares issued during period 159,544 77,914
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  
Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares included in equity incentive pool 7,900,000  
Deferred Compensation, Share-based Payments    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense | $ $ 2,000 $ 2,800
2017 performance period | Deferred Compensation, Share-based Payments    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares issued | $ $ 3,000  
2017 performance period | Deferred Compensation, Share-based Payments | Stock Compensation Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fully vested shares 506,017  
2016 performance period | Deferred Compensation, Share-based Payments    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares issued | $   $ 1,600
2016 performance period | Deferred Compensation, Share-based Payments | Stock Compensation Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fully vested shares   302,326
Director | Deferred Compensation, Share-based Payments    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of shares issued | $ $ 399 $ 164
Fully vested shares 97,138 28,732