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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of the Company's Stock Option Activity | A summary of the Company’s stock option activity is as follows:
|  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value |
Options outstanding as of December 31, 2019 |  |  | 1,058,652 |  |  | $ | 21.82 |  |  |  |  |
Granted |  |  | 250,432 |  |  |  | 12.37 |  |  |  |  |
Exercised |  |  | (11,250 | ) |  |  | 9.27 |  |  |  |  |
Forfeited |  |  | (220,714 | ) |  |  | 16.44 |  |  |  |  |
Cancelled |  |  | (9,240 | ) |  |  | 14.78 |  |  |  |  |
Options outstanding as of December 31, 2020 |  |  | 1,067,880 |  |  | $ | 20.91 |  |  | $ | 0.1 |
Options exercisable as of December 31, 2020 |  |  | 844,952 |  |  | $ | 21.94 |  |  | $ | — |
Schedule of the Assumptions Used to Estimate the Fair Value of Each Option Grant | The fair value of each option grant was estimated at the date of grant using the following assumptions:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Expected life (years) |  |  | 6.5 |  |  |  | 6.5 |  |  |  | 6.5 |
Risk-free interest rate |  |  | 1.2 | % |  |  | 2.6 | % |  |  | 2.8 | %
Expected volatility |  |  | 42.3 | % |  |  | 39.8 | % |  |  | 43.7 | %
Expected dividend yield |  |  | — | % |  |  | — | % |  |  | — | %
Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Share Activity | A summary of activity for restricted stock units is as follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested as of December 31, 2019 |  |  | 290,563 |  |  | $ | 22.55 |
Granted |  |  | 333,269 |  |  |  | 11.64 |
Vested |  |  | (177,307 | ) |  |  | 21.66 |
Forfeited |  |  | (84,232 | ) |  |  | 14.27 |
Unvested as of December 31, 2020 |  |  | 362,293 |  |  | $ | 14.87 |
Performance Shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of the Assumptions Used to Estimate the Fair Value of Each Option Grant | The fair value of each total shareholder return performance share unit was estimated at the date of grant using the following assumptions:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Correlation |  |  | 32.2 | % |  |  | 32.5 | % |  |  | 29.5 | %
Risk-free interest rate |  |  | 1.1 | % |  |  | 2.5 | % |  |  | 2.4 | %
Expected volatility |  |  | 47.5 | % |  |  | 47.0 | % |  |  | 33.8 | %
Expected dividend yield |  |  | — | % |  |  | — | % |  |  | — | %
Schedule of Nonvested Share Activity | A summary of activity for performance share units is as follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested as of December 31, 2019 |  |  | 457,583 |  |  | $ | 26.25 |
Granted |  |  | 328,310 |  |  |  | 12.67 |
Vested |  |  | (97,135 | ) |  |  | 26.11 |
Forfeited |  |  | (330,423 | ) |  |  | 21.05 |
Unvested as of December 31, 2020 |  |  | 358,335 |  |  | $ | 18.64 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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