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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

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