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Stock-based Compensation and Outstanding Awards (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Significant Assumptions Used to Calculate the Grant Date Fair Market Values of Options Granted | For the stock options granted in 2020, 2019 and 2018, the fair value of each option award was estimated on the date of grant using the Black-Scholes framework that uses the assumptions noted in the table below.
|  | December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Valuation Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  | 43.7 | % |  |  | 43.7 | % |  |  | 44.2 | %
Risk-free interest rate |  |  | 1.4 | % |  |  | 2.5 | % |  |  | 2.7 | %
Expected dividends (per share) |  | $ | — |  |  | $ | — |  |  | $ | — |
Expected term (in years) |  | 4.5 |  |  | 4.5 |  |  | 4.5 |
Summary of Stock Option Activity | The following table summarizes award activity for stock options:
Stock Options |  | Shares (in thousands) |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions) |
Outstanding as of December 31, 2019 |  |  | 5,126 |  |  | $ | 20.11 |  |  |  |  |  |  |
Granted |  |  | 697 |  |  |  | 9.53 |  |  |  |  |  |  |
Forfeited and expired |  |  | (1,437 | ) |  |  | 21.61 |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |
Outstanding as of December 31, 2020 |  |  | 4,386 |  |  | $ | 17.93 |  |  | 3.39 |  | $ | — |
Exercisable at December 31, 2020 |  |  | 3,166 |  |  | $ | 20.70 |  |  | 2.64 |  | $ | — |
Summary of Status of Nonvested Shares of RSAs, RSUs and PSAs | The following table summarizes award activity for RSAs and RSUs:
RSAs / RSUs |  | Shares (in thousands) |  |  | Weighted-Average Grant-Date Fair Value |
Nonvested as of December 31, 2019 |  |  | 1,272 |  |  | $ | 19.38 |
Granted |  |  | 374 |  |  |  | 8.78 |
Vested (1) |  |  | (963 | ) |  |  | 22.69 |
Forfeited |  |  | (49 | ) |  |  | 11.88 |
Nonvested as of December 31, 2020 |  |  | 634 |  |  | $ | 10.25 |
| (1) | 256 thousand shares were withheld and retired from the vesting of shares to employees to satisfy minimum tax withholding.
The following table summarizes award activity for performance stock awards:
PSAs |  | Shares (in thousands) |  |  | Weighted-Average Grant-Date Fair Value |
Nonvested as of December 31, 2019 |  |  | 213 |  |  | $ | 15.67 |
Granted |  |  | 195 |  |  |  | 12.12 |
Vested (1) |  |  | (52 | ) |  |  | 20.64 |
Forfeited |  |  | (41 | ) |  |  | 16.63 |
Nonvested as of December 31, 2020 |  |  | 315 |  |  | $ | 12.53 |
(1) 15 thousand shares were withheld and retired from the vesting of shares to employees to satisfy minimum tax withholding.

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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