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Stock Options And Restricted Stock Awards (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options shares granted 285,000 40,000 121,000
Number of stock options exercised 380,000 44,000 66,000
Excess tax benefit from exercise of stock options $ 1,090 $ 269 $ 816
Restricted stock awards shares 108,000 58,000 36,000
Restricted stock weighted average fair value per share $ 21.14 $ 23.32 $ 22.75
2006 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 5 years    
Share-based payment award, expiration period 10 years    
2006 Stock Incentive Plan [Member] | Holdings [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation number of shares available for grant 899,000    
2009 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options shares granted 1,500,000    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option compensation expense $ 600 $ 600 $ 500
Unrecognized compensation cost $ 2,400    
Recognization period for unrecognized compensation cost 5 years    
Intrinsic value on vested stock options $ 1,500 5,900 6,300
Intrinsic value on outstanding stock options 1,900 7,000 8,800
Intrinsic value on exercised stock options $ 3,900 $ 900 $ 1,000
Number of stock options exercised 380,000 44,000 66,000
Number of non-cash stock options exercised   26,000  
Excess tax benefit from exercise of stock options $ 1,100 $ 300 $ 800
Stock Options [Member] | Minimum [Member] | 2006 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 5 years    
Stock Options [Member] | Maximum [Member] | 2006 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 10 years    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option compensation expense $ 500 $ 900 $ 300
Restricted stock awards, vested fair value $ 400    
Restricted Stock [Member] | 2009 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation number of shares available for grant 598,442    
Unrecognized compensation cost $ 1,600    
Restricted stock awards shares 108,000    
Restricted stock weighted average fair value per share $ 21.14