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Stockholders' Equity and Employee Benefit Plans - Narrative (Details) shares in Thousands | 1 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2020 shares | Dec. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) installmentAnniversary shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of installment anniversaries | installmentAnniversary |  |  |  | 3 |  |
Granted (shares) | shares |  |  |  | 1,847 |  |
Share-based compensation |  | $ 2,000,000 | $ 17,000,000 | $ 22,000,000 | $ 18,000,000 |
Unrecognized compensation expense |  |  |  | $ 42,000,000 |  |
Unrecognized compensation expense, weighted average period |  |  |  | 1 year 2 months 26 days |  |
Matching contributions amount |  |  |  | $ 25,000,000 | 20,000,000 |
Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employer percent match of contribution |  |  |  | 100.00% |  |
Percent match of gross pay |  |  |  | 2.00% |  |
Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employer percent match of contribution |  |  |  | 50.00% |  |
Percent match of gross pay |  |  |  | 4.00% |  |
Performance Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (shares) | shares | 500 |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Performance Stock Units | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage of target awards | 0.00% |  |  |  |  |
Performance Stock Units | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage of target awards | 200.00% |  |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Share-based compensation |  |  |  | $ 0 | $ 0 | $ 0
Number of equity awards granted (in shares) | shares |  |  |  | 72 |  |
Expiration term |  |  |  | 10 years |  |

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