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Share-Based Compensation (Narrative) (Details) shares in Thousands, $ in Thousands, $ / shares in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ |  | $ 30,951 | $ 39,278 | $ 25,157
Income tax benefit resulting from share-based compensation expense | $ |  | 3,965 | 4,861 | 4,190
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding | $ |  | $ 57,400 |  |
Weighted average recognition period for unrecognized compensation expense, in years |  | 1 year 6 months |  |
Intrinsic value of stock options exercised | $ |  | $ 163,000 | $ 83,700 | $ 87,100
Nonvested, intrinsic value | $ / shares |  | $ 108.8 |  |
Number of unissued shares of common stock each DSU represents right to receive (in shares) |  | 1 |  |
Deferred stock units, outstanding (in shares) | 143 | 87 | 143 |
2018 Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized for grant under share-based incentive plans (in shares) |  |  |  | 7,500
Shares available for grant under share-based incentive plans (in shares) |  | 6,500 |  |
Stock options and stock appreciation rights |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Ratio of shares issued under share-based awards to shares authorized under stock plans |  |  |  | 1
Awards other than stock options and stock appreciation rights |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Ratio of shares issued under share-based awards to shares authorized under stock plans |  |  |  | 2.4
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ | $ 10,900 |  |  |
Income tax benefit resulting from share-based compensation expense | $ | $ (800) |  |  |
Award vesting rights, percentage |  |  | 25.00% |
Fair value of options vested during period | $ |  | $ 14,600 | $ 12,200 | $ 10,500
Restricted stock units (RSU's) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting rights, percentage |  |  | 25.00% |
Fair value of awards vested during period | $ |  | $ 27,900 | $ 23,800 | $ 24,500
Vested (in shares) |  | 94 |  |
Deferred Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Deferred stock units, outstanding (in shares) | 143 | 87 | 143 |
Vested (in shares) |  | 59 |  |
1997 Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized for grant under share-based incentive plans (in shares) |  | 4,700 |  |
Shares available for grant under share-based incentive plans (in shares) |  | 1,100 |  |
Discount from market value for employee stock purchase rights |  | 15.00% |  |
Common stock issued in connection with the Employee Stock Purchase Plan (in shares) |  | 39 | 47 | 52
Share-based Compensation Award, Tranche One | Stock options granted to employees with ratable vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 5 years |
Share-based Compensation Award, Tranche One | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Contractual term |  |  | 7 years |
Share-based Compensation Award, Tranche One | Restricted stock units granted to employees with ratable vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 5 years |
Share-based Compensation Award, Tranche Two | Stock options granted to employees with ratable vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 4 years |
Share-based Compensation Award, Tranche Two | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Contractual term |  |  | 10 years |
Share-based Compensation Award, Tranche Two | Restricted stock units granted to employees with ratable vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 4 years |

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