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Stock-Based Compensation Plans (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Plan
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock-based compensation plans | Plan 3    
Stock-based compensation expense | $ $ 5,379 $ 4,843 $ 3,668
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]      
Weighted-average grant date fair value | $ $ 20,600 $ 18,400 $ 12,300
Stock Options [Member]      
Options, shares [Roll Forward]      
Outstanding, beginning of period (in shares) 9,875 16,875  
Expired (in shares) 0 0  
Exercised (in shares) (9,875) (7,000)  
Forfeited, other (in shares) 0 0  
Outstanding, end of period (in shares) 0 9,875 16,875
Options exercisable, end of period (in shares) 0    
Options, weighted average exercise price [Roll Forward]      
Outstanding, beginning of period (in dollars per share) | $ / shares $ 10.99 $ 12.14  
Expired (in dollars per share) | $ / shares 0 0  
Exercised (in dollars per share) | $ / shares 10.99 13.76  
Forfeited, other (in dollars per share) | $ / shares 0 0  
Outstanding, end of period (in dollars per share) | $ / shares 0 $ 10.99 $ 12.14
Options exercisable, end of period (in dollars per share) | $ / shares $ 0    
Options, additional disclosures [Abstract]      
Outstanding, weighted average remaining contractual term 0 years 4 months 24 days 1 year
Options exercisable, weighted average remaining contractual term 0 years    
Total intrinsic value of options exercised | $ $ 300 $ 200  
Options granted (in shares) 0    
Performance-Based Shares [Member]      
Restricted and Performance Stock Grants [Abstract]      
Measuring period for performance-based shares 3 years    
Award vesting rights Selected executives and other key personnel are granted performance awards whose vesting is contingent upon meeting various performance measures with a retention feature. Performance-based shares are subject to a three year measuring period and the achievement of performance targets and, depending upon the achievement of such performance targets, they may become vested on the third anniversary of the date of grant.    
Restricted Shares [Member]      
Restricted and Performance Stock Grants [Abstract]      
Award vesting rights Restricted shares granted to employees become fully vested upon the third anniversary of the date of grant; and for selected key executives certain additional restricted share grants vest 25% upon the attainment of age 60, 25% upon the attainment of age 63 and become fully vested upon the attainment of age 65. Restricted shares granted to directors become fully vested upon the first anniversary of the date of grant. Commencing with the 2015 grants, restricted and performance shares issued to certain key executives and directors are subject to a one or two year holding period upon the lapse of the three year vesting period.    
Restricted Shares [Member] | Age 60 [Member]      
Restricted and Performance Stock Grants [Abstract]      
Vesting percentage 25.00%    
Restricted Shares [Member] | Age 63 [Member]      
Restricted and Performance Stock Grants [Abstract]      
Vesting percentage 25.00%    
Restricted Shares [Member] | Age 65 [Member]      
Restricted and Performance Stock Grants [Abstract]      
Vesting percentage 100.00%    
Restricted and Performance-Based Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense | $ $ 5,000 4,300 $ 3,200
Stock-based compensation expense, net of tax | $ 3,200 2,800 $ 2,000
Options, additional disclosures [Abstract]      
Unamortized compensation expense | $ $ 12,700 $ 11,800  
Restricted and performance-based stock, shares [Roll Forward]      
Beginning of period (in shares) 749,018 630,600  
Granted (in shares) 211,950 256,443  
Vested (in shares) (192,768) (132,325)  
Forfeited (in shares) (9,650) (5,700)  
End of period (in shares) 758,550 749,018 630,600
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]      
Beginning of period (in dollars per share) | $ / shares $ 24.62 $ 19.47  
Granted (in dollars per share) | $ / shares 31.79 32.22  
Vested (in dollars per share) | $ / shares 22.13 15.50  
Forfeited (in dollars per share) | $ / shares 29.30 18.77  
End of period (in dollars per share) | $ / shares $ 27.19 $ 24.62 $ 19.47
Restricted and Performance-Based Shares [Member] | Employees [Member]      
Options, additional disclosures [Abstract]      
Weighted average period of recognition for unrecognized compensation expense 5 years 9 months 18 days 5 years 1 month 6 days  
Restricted and Performance Stock Grants [Abstract]      
Estimated forfeitures 5.00%    
Restricted and Performance-Based Shares [Member] | Executives [Member]      
Restricted and Performance Stock Grants [Abstract]      
Estimated forfeitures 0.00%    
Restricted and Performance-Based Shares [Member] | Directors [Member]      
Options, additional disclosures [Abstract]      
Weighted average period of recognition for unrecognized compensation expense 3 months 18 days 3 months 18 days  
Restricted and Performance Stock Grants [Abstract]      
Estimated forfeitures 0.00%    
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member]      
Restricted and Performance Stock Grants [Abstract]      
Expiration of vesting period 3 years    
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Minimum [Member]      
Restricted and Performance Stock Grants [Abstract]      
Holding period for restricted and performance shares issued 1 year    
Post vesting holding period for restricted and performance shares issued 1 year    
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Maximum [Member]      
Restricted and Performance Stock Grants [Abstract]      
Holding period for restricted and performance shares issued 2 years    
Post vesting holding period for restricted and performance shares issued 2 years    
2006 Omnibus Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock-based compensation plans | Plan 1    
Shares authorized for issuance (in shares) 1,900,000    
Share-based compensation basic and diluted (in dollars per share) | $ / shares $ 0.14 $ 0.12 $ 0.09
2006 Omnibus Incentive Plan [Member] | Stock Options [Member]      
Options, shares [Roll Forward]      
Outstanding, end of period (in shares) 0    
2006 Omnibus Incentive Plan [Member] | Performance-Based Shares [Member]      
Restricted and performance-based stock, shares [Roll Forward]      
Granted (in shares) 47,500 46,250  
2006 Omnibus Incentive Plan [Member] | Restricted Shares [Member]      
Restricted and performance-based stock, shares [Roll Forward]      
Granted (in shares) 164,450 210,193  
2006 Omnibus Incentive Plan [Member] | Restricted and Performance-Based Shares [Member]      
Restricted and Performance Stock Grants [Abstract]      
Restricted and performance-based stock grants issued, net of forfeitures (in shares) 1,618,380    
Common stock available for future grants (in shares) 281,620