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Stock-based Compensation (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Feb. 13, 2018
shares
Feb. 14, 2017
shares
Feb. 16, 2016
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
plan
shares
Dec. 31, 2018
USD ($)
plan
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of plans | plan       2 2      
Number of additional shares authorized (shares) | shares               1,100,000
Stock-based compensation       $ 9,900 $ 34,194 $ 22,942 $ 22,079  
Granted (shares) | shares         241,988      
Treasury Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation, net of awards issued (shares) | shares         (218,625) (191,513) (141,106)  
Executive Management [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation       $ 9,900   $ 7,900    
Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (shares) | shares       522,786 522,786      
Number of shares available for grant (shares) | shares       954,552 954,552      
Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Director Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (shares) | shares       19,002 19,002      
Number of shares available for grant (shares) | shares       537,086 537,086      
Total Restricted Stock Award [Member] | Performance Share Award Program 2016 Grant [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation         $ 11,700      
Performance Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation         9,900      
Performance Share Award Program [Member] | Performance Share Award Program 2016 Grant [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation         $ 3,900 3,900 $ 3,900  
Granted (shares) | shares     122,515          
Options, outstanding, number (shares) | shares       122,515 122,515      
Shares, issued (shares) | shares       38,351 38,351      
Stock comp shares surrendered, value     $ 2,300          
Stock comp shares surrendered, per share price (USD per share) | $ / shares     $ 59.66          
Performance Share Award Program [Member] | Performance Share Award Program 2017 Grant [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (shares) | shares   128,112            
Allocated share-based compensation expense, net of tax         $ 14,200      
Award vesting period         3 years      
Allocated share-based compensation expense         $ 8,700 4,700    
Compensation cost not yet recognized, period for recognition         12 months      
Performance Share Award Program [Member] | Performance Share Award Program 2018 Grant [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation         $ 11,400      
Granted (shares) | shares 162,772              
Allocated share-based compensation expense, net of tax         $ 16,200      
Award vesting period         3 years      
Compensation cost not yet recognized, period for recognition         24 months      
Restricted Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation         $ 8,900 $ 9,000 $ 10,500  
Granted (shares) | shares         115,618 101,811 104,164  
Award vesting period         6 years      
Compensation cost not yet recognized, period for recognition         46 months      
Compensation cost not yet recognized       $ 27,200 $ 27,200      
Grants, fair value         11,600 $ 9,500 $ 10,000  
Vested in period, intrinsic value         9,000 9,600 9,900  
Restricted Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Director Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation         $ 1,400 $ 1,500 $ 900  
Granted (shares) | shares         8,322 9,093 10,680  
Award vesting period         1 year 1 year 3 years  
Compensation cost not yet recognized, period for recognition         3 months      
Compensation cost not yet recognized       $ 300 $ 300      
Grants, fair value         $ 900 $ 1,000 $ 1,100  
Maximum [Member] | Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (shares) | shares               11,900,000
Maximum [Member] | Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Director Stock Award Program [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant (shares) | shares       1,400,000 1,400,000