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Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2023
Employee Benefit Plans [Abstract] |
Employee Benefit Plans | Employee Benefit Plans 401(k) Plan The Company has a defined contribution plan covering all eligible employees. Under the plan, employees may contribute up to 90 percent of their eligible annual compensation with the Company making matching contributions on employee deferrals of up to 5 percent of eligible employee wages. The Company recognized expense under this plan of $25.5 million, $24.0 million, and $21.4 million for the years ended December 31, 2023, 2022 and 2021, respectively. Share-based employee compensation The Company reserved 2,000,000 shares of common stock for the Company to grant stock options, restricted stock, cash-settled stock appreciation rights ("SARs") and other stock-based awards to certain officers, directors and employees of the Company under the 2022 Long-Term Incentive Plan (the "2022 Plan"). The 2022 Plan is administered by the compensation committee of the board of directors. Employee Stock Purchase Plan The Company reserved 1,000,000 shares of common stock for employee purchases under the 2014 Employee Stock Purchase Plan ("ESPP"). Shares are purchased semi-annually, at a discount, based on the market value at period-end. Employees may contribute up to 25 percent of their base pay per offering period, not to exceed $25,000 each calendar year, for the purchase of common stock. The ESPP is a compensatory plan under applicable accounting guidance and results in the recognition of compensation expense. The following table provides information about the Company’s ESPP activity during 2023, 2022, and 2021:
Year Ended |  | Total number of shares purchased in year |  | Average price paid per share |  | Weighted-average fair value of discount under the ESPP (1)
December 31, 2021 |  | 39,760 |  |  | $ | 174.68 |  |  | $ | 30.00 |
December 31, 2022 |  | 73,268 |  |  | $ | 97.85 |  |  | $ | 16.25 |
December 31, 2023 |  | 99,802 |  |  | $ | 85.27 |  |  | $ | 14.44 |
(1) The weighted-average fair value of the discount under the ESPP granted is equal to a percentage discount from the market value of the common stock at the end of each semi-annual purchase period. 15 percent is the maximum allowable discount under the ESPP. Compensation expense For the years ended December 31, 2023, 2022 and 2021, the Company recorded compensation expense of $31.5 million, $16.3 million and $17.2 million, respectively, related to restricted stock, stock options and the ESPP. Forfeiture rates are estimated at the time of grant based on historical actuals for similar grants and are matched to actuals over the vesting period. The unrecognized compensation cost was $39.7 million as of December 31, 2023 for unvested restricted stock expected to be recognized over a weighted-average period of 2.69 years. As of December 31, 2023, there was $0.1 million unrecognized compensation cost related to stock options. Restricted stock awards The closing price of the Company's stock on the date of grant is used as the fair value for the issuance of restricted stock. Most of the Company's unvested restricted stock awards, subject generally to the individual's continued employment or service, vest over a three year period or longer for certain of the Company's executive officers. A summary of the status of non-vested restricted stock grants during the years ended December 31, 2023, 2022 and 2021 is presented below:
| Shares |  | Weighted Average Grant Date Fair Value Per Share
Non-vested at December 31, 2020 | 265,527 |  |  | $ | 142.25 |
Granted | 120,456 |  |  | 194.66 |
Vested | (197,530) |  |  | 136.71 |
Forfeited | (6,900) |  |  | 147.05 |
Non-vested at December 31, 2021 | 181,553 |  |  | $ | 183.63 |
Granted | 374,540 |  |  | 89.31 |
Vested | (74,170) |  |  | 180.54 |
Forfeited | (52,055) |  |  | 123.01 |
Non-vested at December 31, 2022 | 429,868 |  |  | $ | 109.33 |
Granted | 567,004 |  |  | 93.57 |
Vested | (238,020) |  |  | 119.00 |
Forfeited | (151,459) |  |  | 94.07 |
Non-vested at December 31, 2023 | 607,393 |  |  | $ | 94.64 |
The total grant date fair value of restricted stock that vested during the years ended December 31, 2023, 2022 and 2021 was $28.3 million, $13.4 million and $27.0 million, respectively.

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- Definition Employee Benefit Plans [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 710 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//710/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 712 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//712/tableOfContent Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//715/tableOfContent Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//718/tableOfContent + Details
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