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Share-Based Compensation (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | $ 39,278 | $ 25,157 | $ 23,517
Income tax benefit resulting from share-based compensation expense |  | 4,861 | 4,190 | 6,810
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding | $ 50,100 | $ 50,100 |  |
Weighted average recognition period for unrecognized compensation expense, in years |  | 1 year 8 months 12 days |  |
Intrinsic value of stock options exercised |  | $ 83,700 | $ 87,100 | 78,300
Number of unissued shares of common stock each DSU represents right to receive (in shares) |  | 1 |  |
Deferred stock units, outstanding (in shares) | shares | 143,000,000 | 143,000,000 | 162,000,000 |
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) | shares |  |  | 7,500,000 |
Shares available for grant under share-based incentive plans (in shares) | shares | 6,800,000 | 6,800,000 |  |
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 |  | $ 12,200 | $ 10,500 | 9,200
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 |  | $ 23,800 | $ 24,500 | $ 22,100
Deferred Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Deferred stock units, outstanding (in shares) | shares | 143,000 | 143,000 | 162,000 |
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) | shares | 4,700,000 | 4,700,000 |  |
Shares available for grant under share-based incentive plans (in shares) | shares | 1,100,000 | 1,100,000 |  |
Discount from market value for employee stock purchase rights |  | 15.00% |  |
Common stock issued in connection with the Employee Stock Purchase Plan (in shares) | shares |  | 47,000 | 52,000 | 61,000
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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