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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation   $ 1,162 $ 1,149 $ 2,183
Income tax benefit recognized   $ 330 $ 405 768
Stock options exercised, shares    
Options granted    
Proceeds from exercise of stock options       $ 4,925
weighted-average grant-date fair value   $ 15.44 $ 16.57  
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options exercised, shares   0 0 240,410
Intrinsic value of options exercised       $ 2,258
Options granted   0 0 0
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense   $ 685    
weighted-average grant-date fair value   $ 15.44 $ 16.57 $ 24.04
Fair value of stock awards   $ 475 $ 486 $ 754
Remaining requisite service period   22 months    
The 2005 Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award, Number of Shares Authorized   2,459,616    
Shares available for grant   689,002    
The 2005 Long Term Incentive Plan [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award contractual term   10 years    
The 2005 Long Term Incentive Plan [Member] | Performance Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award contractual term   10 years    
Options granted 350,000      
Expected volatility 49.22%      
Derived service period   10 years    
Expected dividend yield 2.19%      
quarterly dividend payment $ 0.09      
grant date stock price $ 16.44      
Risk-free rate 2.30%      
The 2005 Long Term Incentive Plan [Member] | Performance Stock Options [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 34.00%      
Threshold Stock Price $ 5.00      
The 2005 Long Term Incentive Plan [Member] | Performance Stock Options [Member] | Share-based Compensation Award, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 33.00%      
Threshold Stock Price $ 10.00      
The 2005 Long Term Incentive Plan [Member] | Performance Stock Options [Member] | Share-based Compensation Award, Tranche Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 33.00%      
Threshold Stock Price $ 15.00      
Minimum [Member] | The 2005 Long Term Incentive Plan [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award Vesting Period   1 year    
Minimum [Member] | The 2005 Long Term Incentive Plan [Member] | Performance Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award Vesting Period   11 months 23 days    
Weighted-average grant-date fair value 6.88      
Minimum [Member] | The 2005 Long Term Incentive Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award Vesting Period   1 year    
Maximum [Member] | The 2005 Long Term Incentive Plan [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award Vesting Period   3 years    
Maximum [Member] | The 2005 Long Term Incentive Plan [Member] | Performance Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award Vesting Period   2 years 4 months 21 days    
Weighted-average grant-date fair value $ 7.25      
Maximum [Member] | The 2005 Long Term Incentive Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award Vesting Period   3 years