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Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 02, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Annual Percentage Increase In Number Of Shares Available For Issuance 1.50%          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 602,684          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   15,751,005   15,751,005    
Remaining Aggregate Number of Shares Available For Issuance   7,085,031   7,085,031    
Share-based Compensation   $ 3,000,000.0 $ 2,000,000.0 $ 8,500,000 $ 5,200,000  
Share-based Payment Arrangement, Amount Capitalized       0 0  
Income tax expense (benefit) related to the exercise of stock options, vested cancellations and the vesting of restricted stock and restricted stock units   (200,000) $ (900,000) $ (1,000,000.0) $ (1,600,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0   489,947
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         5 years  
Expected Annual Cash Dividend         $ 1.08  
Granted, Weighted Average Fair Value         $ 10.10  
Share-based Payment Award, Options, Vested, Fair Value       $ 1,800,000 $ 1,200,000  
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized   $ 3,700,000   $ 3,700,000    
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized, Period for Recognition       2 years    
Restricted Stock [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year 1 year  
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSU Performance Factor, Number of Shares Issued       1   1.5