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Stock-Based Compensation Stock-Based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding 2,468,900 2,953,694  
Exercise period of options once vested 10 years    
Stock-based compensation expense $ 5,961,000 $ 3,896,000 $ 9,209,000
Tax benefit recognized in the statements of earnings 1,739,000 1,442,000 658,000
Share-based compensation expense, net of tax $ 4,222,000 $ 2,454,000 8,551,000
Stock options granted 522,731    
Exercise of stock options, shares (137,509)    
Stock options forfeited (373,690)    
Stock options expired (496,326)    
Stock options outstanding, weighted average exercise price $ 19.37 $ 21.34  
Stock options granted, weighted average exercise price 8.73    
Stock options exercised, weighted average exercise price 10.19    
Stock options forfeited, weighted average exercise price 12.79    
Stock options expired, weighted average exercise price $ 27.40    
Stock options outstanding, weighted average remaining contractual life 6 years 23 days    
Stock options outstanding, aggregate intrinsic value $ 2,090,000    
Stock options exercisable 1,424,800    
Stock options exercisable, weighted average exercise price $ 25.81    
Stock options exercisable, weighted average remaining contractual life 4 years 4 months 18 days    
Stock options exercisable, aggregate intrinsic value $ 2,090,000    
Stock options exercised, intrinsic value 418,900 $ 53,300 $ 0
Tax benefits from exercise of stock options $ 146,600 $ 18,700  
Weighted average grant date fair value $ 3.80 $ 2.92 $ 3.06
Weighted average risk free interest rate 2.51% 1.78% 1.31%
Weighted average expected dividend yield 0.00% 3.03% 3.16%
Weighted average expected volatility 49.58% 45.44% 39.64%
Weighted average expected life (in years) 4 years 7 months 18 days 4 years 6 months 4 years 7 months 17 days
Restricted share units outstanding 1,855,862 1,344,411  
Restricted share units granted 1,188,565    
Restricted share units vested (188,029)    
Restricted share units forfeited (489,085)    
Restricted share units outstanding, weighted average exercise price $ 8.82 $ 10.87  
Restricted share units granted, weighted average exercise price 8.73    
Restricted share units vested, weighted average exercise price 23.34    
Restricted share units forfeited, weighted average exercise price $ 8.66    
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 1,022,482 1,554,931  
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 2,625,206 1,705,660  
Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding 677,074 1,037,514  
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 $ 1,388,000 $ 2,023,000 $ 2,954,000
Unvested awards - to result in compensation expense $ 2,400,000    
Weighted average number of years to vesting 2 years 6 months 8 days    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 4,573,000 $ 1,873,000 $ 6,255,000
Unvested awards - to result in compensation expense $ 7,300,000    
Weighted average number of years to vesting 1 year 10 months 1 day    
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