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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION The Company’s Board of Directors has adopted various stock-based compensation plans. The plans provide for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock awards, restricted stock units and performance stock units. Pursuant to the plans, shares are reserved for future issuance by the Company upon exercise of stock options or awards of restricted stock, restricted stock units, or performance stock units granted to directors, officers and other key employees. The table below summarizes the transactions under the Company’s active stock-based compensation plans for the six months ended June 30, 2021:
| Stock Options Outstanding |  | Non-vested Stock Awards Outstanding |  | Non-vested Stock Units Outstanding
(Shares in thousands) | Number of Shares |  | Weighted Average Exercise Price |  | Number of Shares |  | Weighted Average Grant-Date Fair Value |  | Number of Shares |  | Weighted Average Grant-Date Fair Value
Beginning balance, January 1, 2021 | 658 |  |  | $ | 22.48 |  |  | 5 |  |  | $ | 22.35 |  |  | 1,032 |  |  | $ | 24.53 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | 474 |  |  | 29.18 |
Stock options exercised | (183) |  |  | 22.50 |  |  | — |  |  | — |  |  | — |  |  | — |
Stock awards/units vested (earned) | — |  |  | — |  |  | (3) |  |  | 22.48 |  |  | (302) |  |  | 25.77 |
Forfeited/expired | — |  |  | — |  |  | — |  |  | — |  |  | (60) |  |  | 26.02 |
Balance, June 30, 2021 | 475 |  |  | $ | 22.47 |  |  | 2 |  |  | $ | 22.20 |  |  | 1,144 |  |  | $ | 26.02 |
Exercisable, June 30, 2021 | 475 |  |  | $ | 22.47 |  |  |  |  |  |  |  |  |
The following table summarizes information about stock options under the plans outstanding at June 30, 2021:
|  |  |  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number of Shares (In thousands) |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number of Shares (In thousands) |  | Weighted Average Exercise Price
$ | 9.46 |  |  | — |  | $ | 9.46 |  |  | 1 |  | 0.55 |  | $9.46 |  | 1 |  | $9.46
10.65 |  |  | — |  | 10.65 |  |  | 3 |  | 1.58 |  | 10.65 |  | 3 |  | 10.65
20.29 |  |  | — |  | 20.29 |  |  | 47 |  | 3.50 |  | 20.29 |  | 47 |  | 20.29
20.36 |  |  | — |  | 20.36 |  |  | 1 |  | 3.38 |  | 20.36 |  | 1 |  | 20.36
22.20 |  |  | — |  | 22.20 |  |  | 51 |  | 3.73 |  | 22.20 |  | 51 |  | 22.20
22.75 |  |  | — |  | 22.75 |  |  | 293 |  | 4.11 |  | 22.75 |  | 293 |  | 22.75
23.51 |  |  | — |  | 23.51 |  |  | 72 |  | 4.56 |  | 23.51 |  | 72 |  | 23.51
24.07 |  |  | — |  | 24.07 |  |  | 7 |  | 4.21 |  | 24.07 |  | 7 |  | 24.07
$ | 9.46 |  |  | — |  | $ | 24.07 |  |  | 475 |  | 4.05 |  | $22.47 |  | 475 |  | $22.47
The table below summarizes the Company’s performance stock unit activity for the six months ended June 30, 2021:
(In thousands) |  | Performance Stock Units
Non-vested, January 1, 2021 |  | 222 |
Granted |  | 96 |
Vested (earned) |  | (57) |
Forfeited |  | (5) |
Non-vested, June 30, 2021 |  | 256 |
Stock-based compensation expense was $7.6 million for both of the six month periods ended June 30, 2021 and 2020. Stock-based compensation expense is recognized ratably over the requisite service period for all stock-based awards. There was no unrecognized stock-based compensation expense related to stock options at June 30, 2021. Unrecognized stock-based compensation expense related to non-vested stock awards and stock units was $19.6 million at June 30, 2021. At such date, the weighted-average period over which this unrecognized expense is expected to be recognized was 1.9 years. The intrinsic value of stock options outstanding and stock options exercisable at June 30, 2021 was $3.3 million. Aggregate intrinsic value represents the difference between the Company’s closing stock price on the last trading day of the period, which was $29.34 as of June 30, 2021, and the exercise price multiplied by the number of options outstanding. The total intrinsic value of stock options exercised during the six months ended June 30, 2021 and 2020, was $1.3 million and $6,000, respectively. The fair value of the Company’s employee stock options granted is estimated on the date of grant using the Black-Scholes option-pricing model. This model requires the input of highly subjective assumptions, changes to which can materially affect the fair value estimate. There were no stock options granted during the six months ended June 30, 2021 and 2020.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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