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Stockholders' Equity
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Stockholders' Equity Stockholders’ Equity
Equity Based Awards
The 2018 Incentive Plan is administered by the Compensation Committee of the Company’s Board of Directors. The total number of shares of the Company's common stock originally reserved were 2,210,544 shares of our common stock and a total of 1,746,779 shares are currently available for issuance. A variety of discretionary awards for employees, officers, directors, and consultants are authorized under the 2018 Incentive Plan, including incentive or non-qualified stock options and restricted stock, restricted stock units and performance-based awards. All awards must be evidenced by a written award certificate which will include the provisions specified by the Compensation Committee of the Board of Directors. The Compensation Committee determines the exercise price for stock options, which cannot be less than the fair market value of the Company’s common stock as of the date of grant.
Share Based Compensation
Nonvested Stock
The Company issues stock-based compensation to employees in the form of nonvested stock, which is an award of common stock subject to certain restrictions. The awards, which the Company calls nonvested shares, generally vest over five years, conditioned on continued employment for the full incentive period. Compensation expense for the nonvested stock is recognized for the awards that are expected to vest. The expense is based on the fair value of the awards on the grant date recognized on a straight-line basis over the requisite service period, which generally relates to the vesting period. The Company estimates forfeitures at the time of grant and revises the estimate in subsequent periods if actual forfeitures differ to ensure that total compensation expense recognized is at least equal to the value of vested awards. The Company applies the same guidance to nonemployee share-based awards.
During 2021, employees and a consultant were granted 109,985 and 5,735, respectively, of nonvested shares of common stock. During 2020, employees and a consultant were granted 114,680 and 10,890, respectively. During 2019, 163,250 nonvested shares were granted to employees. All shares granted were granted pursuant to the 2018 Incentive Plan. The shares will vest over a period of five years, conditioned on continued employment and in accordance with the consulting agreement.
During 2021, 2020 and 2019, respectively, the Company granted 7,200, 9,900 and 17,880 nonvested shares of stock to the independent directors. The shares vest 100% on the one year anniversary date. During 2021, the Company granted 3,500 nonvested shares of common stock to the Company's Lead Director, which shares vest one-third at the date of grant and one-third on each of the first two anniversaries of the grant date. During 2020, one retired director was granted 775 nonvested shares of common stock, which vest 100% at the grant date. Shares granted to directors were pursuant to the Second Amended and Restated 2005 Non-Employee Directors Compensation Plan.
The fair value of nonvested shares is determined based on the closing trading price of the Company’s shares on the grant date. The weighted average grant date fair values of nonvested shares granted during the years ended December 31, 2021, 2020 and 2019 were $186.08, $123.89 and $110.56, respectively.
The following table represents the share grants stock activity for the year ended December 31, 2021: 
Nonvested stockOptions
Number of
Shares		Weighted average
grant date fair value		Number of
Shares		Weighted average
grant date fair value
Share grants outstanding at December 31, 2020469,631 $89.69 74,235 $42.07 
Granted126,420 186.08 — — 
Vested or exercised(180,235)186.86 — — 
Share grants outstanding at December 31, 2021415,816 $122.40 74,235 $42.07 

As of December 31 2021, there was $37.3 million of total unrecognized compensation cost related to nonvested shares granted. That cost is expected to be recognized over the weighted average period of 2.90 years. The total fair value of shares vested in the year ended 2021, 2020 and 2019 were $14.1 million, $12.2 million, and $9.4 million, respectively. The Company recorded $15.9 million, $14.3 million and $9.6 million in compensation expense related to non-vested stock grants in the years ended December 31, 2021, 2020 and 2019, respectively.
Aggregate intrinsic value for options represents the estimated value of the Company's common stock at the end of the period in excess of the weighted average exercise price multiplied by the number of options exercisable. The aggregate intrinsic value of options outstanding at December 31, 2021 was $7.4 million. The following table summarizes information about stock options outstanding and exercisable at December 31, 2021:
Range of Exercise PriceSharesWtd. Avg. Remaining Contractual LifeWtd. Avg. Exercise Price
$0.00 - $30.00
15,737 2.05$26.11 
$30.01 - $40.00
20,609 4.18$39.38 
Over $40.00
37,889 5.16$47.74 
74,235 4.00$42.07 
Employee Stock Purchase Plan
In 2006, the Company adopted the Employee Stock Purchase Plan allowing eligible employees to purchase the Company’s common stock at 95% of the market price on the last day of each calendar quarter. There were 250,000 shares reserved for the plan.
On June 20, 2013, the Amended and Restated Employee Stock Purchase Plan was approved by the Company’s stockholders. As a result of the amendment, the Employee Stock Purchase Plan was modified as follows:
•An additional 250,000 shares of common stock were authorized for issuance over the term of the Employee Stock Purchase Plan.
•The term of the Employee Stock Purchase Plan was extended from January 1, 2016 to January 1, 2023.
 The following table represents the shares issued during 2021, 2020, and 2019, under the Employee Stock Purchase Plan:
 
Number of
Shares		Weighted Average
Per Share Price
Shares available as of December 31, 2018152,344 
Shares issued in 201919,895 $103.84 
  Shares issued in 202014,313 $152.10 
  Shares issued in 202113,792 $186.20 
Shares available as of December 31, 2021104,344 
Treasury Stock
In conjunction with the vesting of the nonvested shares of stock or exercise of options, recipients incur personal income tax obligations. The Company allows the recipients to turn in shares of common stock to satisfy those personal tax obligations. The Company redeemed 63,028, 78,767 and 107,461 shares of common stock related to these tax obligations during the years ended December 31, 2021, 2020 and 2019, respectively. Additionally, 1,556 shares were forfeited for terminated employees. Such shares are held in treasury stock and are available for reissuance by the Company.
Stock Repurchase
On December 6, 2021, the Company's Board of Directors approved a share repurchase program authorizing repurchases up to $250.0 million of the Company's common stock. The Company may purchase common stock in open market transactions, block or privately negotiated transactions, and may from time to time purchase shares pursuant to a trading plan in accordance with Rule 10b5-1 and Rule 10b-18 under the Exchange Act or by any combination of such methods, in each case subject to compliance with all SEC rules and other legal requirements. The number of shares to be purchased and the timing of the purchases are based on a variety of factors, including, but not limited to, the level of cash balances, credit availability, debt covenant restrictions, general business conditions, the market price of our stock and the availability of alternative investment opportunities. No time limit was set for completion of repurchases under the new authorization, and the program may be suspended or discontinued at any time. The Company uses the cost method to account for the repurchase of common stock. During the twelve months ended December 31, 2021, the Company repurchased 634,869 shares from the open market under its Stock Repurchase plan at an aggregate cost of $83.7 million. The remaining dollar value of shares authorized to be purchased under the Stock Repurchase plan was $166.3 million at December 31, 2021.