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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2020
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 stock appreciation rights, stock awards or units, or performance shares 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, 2020: 
 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
Balance, January 1, 2020692  $22.46  21  $23.19  1,152  $26.79  
Granted—  —  —  —  480  22.37  
Stock options exercised(1) 10.71  —  —  —  —  
Stock awards/units vested (earned)—  —  (5) 21.15  (386) 26.07  
Forfeited/expired(33) 22.49  —  —  (62) 26.66  
Balance, June 30, 2020658  $22.48  16  $23.75  1,184  $25.23  
Exercisable, June 30, 2020658  $22.48  

The following table summarizes information about stock options under the plans outstanding at June 30, 2020:
 
  Options OutstandingOptions 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  11.55$9.461$9.46
10.65  —10.65  32.5810.65310.65
20.29  —20.29  663.7020.296620.29
20.36  —20.36  24.3820.36220.36
22.20  —22.20  743.6322.207422.20
22.75  —22.75  4124.3922.7541222.75
23.51  —23.51  934.8023.519323.51
24.07  —24.07  75.2124.07724.07
$9.46  —$24.07  6584.29$22.48658$22.48
The table below summarizes the Company’s performance stock unit activity for the six months ended June 30, 2020:
(In thousands)Performance Stock Units
Non-vested, January 1, 2020199  
Granted116  
Vested (earned)(80) 
Forfeited(18) 
Non-vested, June 30, 2020217  

Stock-based compensation expense was $7,577,000 and $6,249,000 during the six months ended June 30, 2020 and 2019, respectively. 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, 2020. Unrecognized stock-based compensation expense related to non-vested stock awards and stock units was $21,925,000 at June 30, 2020. 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, 2020 was $28,000. Aggregate intrinsic value represents the difference between the Company’s closing stock price on the last trading day of the period, which was $17.11 as of June 30, 2020, 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, 2020 and June 30, 2019, was $6,000 and $5,000, 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, 2020 and 2019.