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Stock-Based Compensation Stock-Based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding 1,834,862 2,468,900  
Exercise period of options once vested 10 years    
Stock-based compensation expense $ 6,958,000 $ 5,961,000 $ 3,896,000
Tax benefit recognized in the statements of earnings 1,562,000 1,739,000 1,442,000
Share-based compensation expense, net of tax $ 5,396,000 $ 4,222,000 2,454,000
Stock options granted 381,198    
Exercise of stock options, shares (551,008)    
Stock options forfeited (224,396)    
Stock options expired (239,832)    
Stock options outstanding, weighted average exercise price $ 21.70 $ 19.37  
Stock options granted, weighted average exercise price 22.53    
Stock options exercised, weighted average exercise price 12.36    
Stock options forfeited, weighted average exercise price 10.54    
Stock options expired, weighted average exercise price $ 30.96    
Stock options outstanding, weighted average remaining contractual life 6 years 1 month 13 days    
Stock options outstanding, aggregate intrinsic value $ 4,464,000    
Stock options exercisable 973,036    
Stock options exercisable, weighted average exercise price $ 27.60    
Stock options exercisable, weighted average remaining contractual life 4 years 1 month 24 days    
Stock options exercisable, aggregate intrinsic value $ 4,469,000    
Stock options exercised, intrinsic value 5,137,000.0 $ 418,900 53,300
Tax benefits from exercise of stock options $ 1,798,000.0 $ 146,600 $ 18,700
Weighted average grant date fair value $ 8.92 $ 3.80 $ 2.92
Weighted average risk free interest rate 2.07% 2.51% 1.78%
Weighted average expected dividend yield 1.28% 0.00% 3.03%
Weighted average expected volatility 50.93% 49.58% 45.44%
Weighted average expected life (in years) 4 years 7 months 17 days 4 years 7 months 17 days 4 years 6 months
Restricted share units outstanding 1,570,400 1,855,862  
Restricted share units granted 512,567    
Restricted share units vested (351,469)    
Restricted share units forfeited (446,560)    
Restricted share units outstanding, weighted average exercise price $ 14.38 $ 8.82  
Restricted share units granted, weighted average exercise price 28.24    
Restricted share units vested, weighted average exercise price 10.58    
Restricted share units forfeited, weighted average exercise price $ 10.19    
2016 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to issue 6,500,000    
Stock options outstanding 2,556,180 2,625,206  
2006 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to issue 7,000,000    
Stock options outstanding 450,531 1,022,482  
Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to issue 2,468,461    
Stock options outstanding 398,551 677,074  
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of options granted 1 year    
Vesting % of performance based restricted stock units 0.00%    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of options granted 4 years    
Vesting % of performance based restricted stock units 200.00%    
Stock options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 1,273,000 $ 1,388,000 $ 2,023,000
Unvested awards - to result in compensation expense $ 3,500,000    
Weighted average number of years to vesting 2 years 11 months 4 days    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 5,685,000 $ 4,573,000 $ 1,873,000
Unvested awards - to result in compensation expense $ 11,400,000    
Weighted average number of years to vesting 1 year 11 months 19 days    
Restricted Stock Units (RSUs) [Member] | 2006 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to issue 3,500,000