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Stockholders' Equity Stockholders' Equity (Stock-Based Compensation Plans) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 15, 2021
Aug. 12, 2021
Jun. 01, 2021
Apr. 16, 2021
Feb. 19, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Class of Stock [Line Items]                    
Exercise of stock options, shares           32,665 17,913   314,294 17,913
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price             $ 5.70   $ 21.78 $ 5.70
Payment, Tax Withholding, Share-based Payment Arrangement                 $ 1,433,000 $ 281,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares                 12,980  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period, Description           17,790 4,426   166,359 4,426
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 21.81        
Additional authorized amount           $ 50,000,000     $ 50,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Returned for Payroll Taxes           2,192 1,333   20,163 1,333
Advsior                    
Class of Stock [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           112 224   389 808
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value           $ 5,000 $ 6,000   $ 15,000 $ 15,000
Stock options                    
Class of Stock [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value           600,000 300,000   5,000,000 300,000
Proceeds from Stock Options Exercised           0 0   880,000 0
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation           $ 82,000 $ 31,000   $ 1,058,000 $ 31,000
Stock options | Black-Scholes                    
Class of Stock [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           0 0   701,400 20,000
Share price at grant date                   $ 18.02
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value           $ 0 $ 0     $ 92,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period           6,000 8,800   19,684 146,034
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value                 $ 7,115,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures Fair Valueriod           $ 61,000 $ 52,000   $ 181,000 $ 846,000
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                 $ 1,700,000  
Stock options | Monte-Carlo Pricing Model | Share-based Payment Arrangement, Tranche One                    
Class of Stock [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 50,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights                 53.39  
Stock options | Monte-Carlo Pricing Model | Share-based Payment Arrangement, Tranche Two                    
Class of Stock [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights                 77.34  
Restricted Stock Units (RSUs) [Member]                    
Class of Stock [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           0 0   9,300 10,200
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value           $ 0 $ 0   $ 27,000 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value           $ 0 $ 0   $ 324,000 $ 255,000
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation           711 714   10,399 10,588
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation           $ 28,000 $ 16,000   $ 375,000 $ 250,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited           0 0   966 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                 $ 34.79 $ 25.00
Performance awards                    
Class of Stock [Line Items]                    
Share price at grant date $ 45.27 $ 39.48 $ 38.78 $ 35.83            
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost     $ 2,600,000         $ 1,700,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         237,500 29,548 9,782 368,921 39,802 23,756
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value         $ 2,800,000 $ 1,062,000 $ 244,000   $ 1,464,000 $ 469,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period           6,987 0   41,922 33,538
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Fair Value           $ 101,000 $ 0   $ 598,000 $ 631,000