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Share-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 19, 2012
shares
Jun. 30, 2015
USD ($)
item
shares
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
item
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
shares
Mar. 31, 2008
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of stock option plans | item   2   2        
Pre-tax compensation costs   $ 700 $ 600 $ 1,300 $ 900      
1998 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option term       10 years        
Stock Plan expiration date       June 12, 2008        
Number of additional shares authorized | shares       0        
1998 Stock Plan [Member] | Directors [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Nonqualified stock options, vesting period       2 years        
1998 Stock Plan [Member] | Employees [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Qualified stock options, vesting period       5 years        
2008 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option term       10 years        
Shares authorized under the plan | shares 2,000,000             600,000
Number of additional shares authorized | shares 1,400,000              
Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Pre-tax compensation costs   59 43 $ 145 $ 87      
Weighted average grant date fair value of the options granted | $ / shares       $ 4.99 $ 6.49      
Forfeiture rate of stock options granted       5.00%        
Total unrecognized compensation costs   700   $ 700   $ 800    
Weighted average period for compensation costs to be recognized       4 years 3 months 18 days        
Total intrinsic value of stock options exercised   100 0 $ 400 $ 3,300      
Cash received from stock option exercised   0 0 300 2,000      
Stock options vested, fair value   78 60 106 65      
Restricted Stock And Restricted Stock Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Pre-tax compensation costs   600 $ 600 $ 1,100 $ 800      
Restricted Stock And Restricted Stock Units [Member] | Minimum [Member] | Directors [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock, vesting period       1 year        
Restricted Stock And Restricted Stock Units [Member] | Maximum [Member] | Directors [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock, vesting period       3 years        
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total unrecognized compensation costs   $ 7,700   $ 7,700        
Weighted average period for compensation costs to be recognized       4 years 8 months 12 days        
Units outstanding | shares   583,000 597,000 583,000 597,000 579,000 387,000  
Restricted Stock [Member] | Minimum [Member] | Employees [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock, vesting period       5 years        
Restricted Stock [Member] | Maximum [Member] | Employees [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock, vesting period       10 years        
Restricted Stock Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total unrecognized compensation costs   $ 200   $ 200        
Weighted average period for compensation costs to be recognized       1 year        
Restricted stock units issued | shares     0   0      
Units outstanding | shares   11,000 0 11,000 0      
Performance Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Pre-tax compensation costs   $ 66   $ 101        
Total unrecognized compensation costs   $ 500   $ 500        
Weighted average period for compensation costs to be recognized       2 years        
Units outstanding | shares   45,000 0 45,000 0 17,000    
Performance units issued | shares     0   0      
Performance Units [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized under the plan | shares   23,000   23,000        
Performance Units [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized under the plan | shares   68,000   68,000