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Stock-Based Compensation Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Stock-Based Compensation [Abstract] |
Share-based Compensation Options Activity | The following table summarizes the activity of common stock options for the period from December 31, 2018 through the year ended December 31, 2021:
|  | Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2018 |  | 2,941,154 |  |  | $ | 10.79 |  |  |  |  |
Exercised |  | (492,498) |  |  | $ | 8.07 |  |  |  |  |
Forfeited |  | (74,299) |  |  | $ | 8.16 |  |  |  |  |
Outstanding at December 31, 2019 |  | 2,374,357 |  |  | $ | 11.44 |  |  |  |  |
Exercised |  | (43,250) |  |  | $ | 8.64 |  |  |  |  |
Forfeited |  | (157,776) |  |  | $ | 9.23 |  |  |  |  |
Outstanding at December 31, 2020 |  | 2,173,331 |  |  | $ | 9.84 |  | (1) |  |  |
Exercised |  | (208,500) |  |  | $ | 3.56 |  |  |  |  |
Forfeited |  | (39,996) |  |  | $ | 3.53 |  |  |  |  |
Expired |  | (40,484) |  |  | $ | 14.52 |  |  |  |  |
Outstanding at December 31, 2021 |  | 1,884,351 |  |  | $ | 6.99 |  | (2) | 4.97 |  | $ | 7,714 |
Exercisable at December 31, 2021 |  | 1,547,535 |  |  | $ | 7.75 |  |  | 5.03 |  | $ | 5,417 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The Company used a Monte Carlo simulation to estimate the fair value of the portion of the awards subject to the TSR goal, with the following assumptions:
Expected dividend yield |  | — | %
Risk-free interest rate |  | 1.56 | %
Expected volatility |  | 28.57 | %
Expected term (in years) |  | 2.95
Grant date fair value |  | $ | 24.11 |
The Company used a Monte Carlo simulation to estimate the fair value of the awards, with the following assumptions:
Expected dividend yield |  | — | %
Risk-free interest rate |  | 0.20 | %
Expected volatility |  | 41.70 | %
Expected term (in years) |  | 2.95
Grant date fair value |  | $ | 13.21 |
Schedule of Nonvested Restricted Stock Awards, Restricted Stock Units and Performance Stock Unit Activity | The following table summarizes the activity of restricted stock awards, restricted stock units and performance stock units for the period from December 31, 2018 through the year ended December 31, 2021:
|  | Restricted Stock Awards |  | Restricted Stock Units |  | Performance Stock Units
|  | Number of Shares |  | Weighted Average Grant Date Fair Value (per share) |  | Number of Units |  | Weighted Average Grant Date Fair Value (per share) |  | Number of Units |  | Weighted Average Grant Date Fair Value (per share)
Nonvested as of December 31, 2018 |  | 1,770,660 |  |  | $ | 8.39 |  |  | 998,786 |  |  | $ | 16.83 |  |  | — |  |  | $ | — |
Granted |  | — |  |  | $ | — |  |  | 1,245,628 |  |  | $ | 15.42 |  |  | 550,676 |  |  | $ | 15.41 |
Vested |  | (97,140) |  |  | $ | 12.32 |  |  | (541,383) |  |  | $ | 16.68 |  |  | — |  |  | $ | — |
Forfeited |  | (127,390) |  |  | $ | 8.04 |  |  | (74,595) |  |  | $ | 16.09 |  |  | — |  |  | $ | — |
Nonvested as of December 31, 2019 |  | 1,546,130 |  |  | $ | 8.17 |  |  | 1,628,436 |  |  | $ | 15.83 |  |  | 550,676 |  |  | $ | 15.41 |
Granted |  | — |  |  | $ | — |  |  | 1,158,605 |  |  | $ | 16.60 |  |  | 456,311 |  |  | $ | 20.29 |
Vested |  | (29,760) |  |  | $ | 12.32 |  |  | (816,866) |  |  | $ | 16.17 |  |  | — |  |  | $ | — |
Forfeited |  | (619,355) |  |  | $ | 8.04 |  |  | (129,036) |  |  | $ | 16.28 |  |  | (41,251) |  |  | $ | 15.95 |
Nonvested as of December 31, 2020 |  | 897,015 |  |  | $ | 13.80 |  | (1) | 1,841,139 |  |  | $ | 16.14 |  |  | 965,736 |  |  | $ | 17.69 |
Granted |  | — |  |  | $ | — |  |  | 1,697,623 |  |  | $ | 15.39 |  |  | 211,985 |  |  | $ | 13.21 |
Vested |  | — |  |  | $ | — |  |  | (773,619) |  |  | $ | 16.00 |  |  | — |  |  | $ | — |
Forfeited |  | (263,291) |  |  | $ | 15.31 |  | (1) | (257,722) |  |  | $ | 16.03 |  |  | (60,166) |  |  | $ | 17.11 |
Nonvested as of December 31, 2021 |  | 633,724 |  |  | $ | 15.84 |  | (1) | 2,507,421 |  |  | $ | 15.68 |  |  | 1,117,555 |  |  | $ | 16.91 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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