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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Stock-Based Compensation [Abstract]  
Valuation Assumptions, Options

 

The fair value of unvested cash settled stock appreciation rights as of June 30, 2021 was estimated using the Black-Scholes option valuation model with the following assumptions:

 

 

 

 

 

 

 

 

 

Expected

 

Risk Free

 

 

 

 

 

 

 

 

 

Expected

 

Dividend

 

Interest

 

Fair Value

 

Grant Year

 

Grant Date

 

Expected Life

 

Volatility

 

Yield

 

Rate

 

Per Award

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2020

 

1/24/2020

 

4.8 years

 

78.14%

 

0.00%

 

0.83%

 

$

4.88

 

2020

 

9/14/2020

 

5.2 years

 

76.23%

 

0.00%

 

0.89%

 

$

4.74

 

2020

 

11/30/2020

 

5.4 years

 

75.69%

 

0.00%

 

0.92%

 

$

4.57

 

2021

 

1/5/2021

 

5.5 years

 

75.48%

 

0.00%

 

0.93%

 

$

4.65