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Stockholders' Equity Stockholders' Equity (Stock-Based Compensation Plans) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Feb. 19, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Class of Stock [Line Items]        
Exercise of stock options, shares   101,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price   $ 24.18    
Payment, Tax Withholding, Share-based Payment Arrangement   $ 642 $ 234  
Stock Options        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 1,300    
Proceeds from Stock Options Exercised   147    
Payment, Tax Withholding, Share-based Payment Arrangement   $ 295    
Stock Options | Maximum [Member]        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   10 years    
Stock Options | Black-Scholes        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   701,400    
Share price at grant date   $ 34.79    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value   $ 7,100    
Stock Options | Monte-Carlo Pricing Model        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   150,000    
Share price at grant date   $ 34.79    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value   $ 1,700    
Restricted Stock Units (RSUs) [Member]        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   9,300 10,200  
Performance Shares [Member]        
Class of Stock [Line Items]        
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost       $ 1,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 237,500 27,948   368,921