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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of assumptions used to determine the fair value of options as of the grant date The following assumptions were used to determine the fair values as of the grant date for the years ended December 31:
 2018
 Black-ScholesBinomial
Risk-free interest rate (%)
2.66 – 3.10
1.64 – 3.22
Expected stock price volatility (%)
70.31 – 71.86
71.36 – 71.86
Expected dividend yield
—
—
Expected option life (in years)
6.00 – 6.25
2.56 – 4.33
Fair value
$16.17 – $19.68
$14.67 – $20.26
Summary of the weighted average fair value of stock options granted, the total intrinsic value of stock options exercised and the fair value of options vested
The following table summarizes the weighted average grant date fair value of stock options granted per share, the total intrinsic value of stock options exercised and the grant date fair value of stock options that vested during the years ended December 31:
(in thousands, except per share data)202020192018
Weighted average grant date fair value of stock options granted per share$— $— $16.31 
Intrinsic value of options exercised— 54 4,609 
Grant date fair value of stock options that vested2,730 3,053 1,760 
Summary of the activity of the entity's stock options
The following table summarizes the activity related to our stock options:
 Number of optionsWeighted average exercise price
Weighted average contractual term (in years)
Aggregate intrinsic value (in thousands)
Outstanding as of December 31, 20191,468,046 $29.19 4.60$94 
Forfeited(568,132)24.00 
Outstanding as of December 31, 2020899,914 32.47 5.63— 
Exercisable as of December 31, 2020557,620 28.69 5.45— 
Shares authorized under stock option plans, by exercise price range
The following table summarizes information about stock options outstanding and exercisable as of December 31, 2020:
Options outstandingOptions exercisable
Exercise price range (1)
Number
Weighted average remaining contractual life (in years)
Weighted average exercise priceNumber
Weighted average remaining contractual life (in years)
Weighted average exercise price
$10.01 — $20.00
154,200 4.29$18.79 150,038 4.29$18.79 
$20.01 — $30.00
548,348 6.1825.19 324,937 5.7725.19 
$30.01 — $40.00
68,866 6.0833.32 21,270 5.5933.32 
$60.01 — $70.00
58,500 1.1960.76 43,875 1.1960.76 
$80.01 — $90.00
25,000 3.6086.69 6,250 3.6086.69 
$90.01 — $100.00
45,000 3.1895.67 11,250 3.1895.67 
899,914 557,620 
______________________________________
(1)    These options contain market-based and performance-based components as described above.
Shares authorized under stock option plans by vesting price range
The following table summarizes the market prices necessary in order for the market-based options to begin to vest:
Market-based options
Vesting priceOrdinary performanceExtraordinary performance
$50.01 — $60.00
36,726 4,162 
$60.01 — $70.00
11,648 6,250 
$70.01 — $80.00
— 11,500 
$80.01 — $90.00
— 7,362 
$90.01 — $100.00
— 5,325 
$100.01 — $110.00
— 1,000 
$170.01 — $180.00
12,500 — 
$180.01 — $190.00
7,500 14,625 
Over $190.00
15,000 17,500 
Total83,374 67,724 
Weighted average share price$55.14 $50.67 
Restricted shares and restricted share units activity
The following table summarizes the activity related to our restricted shares and restricted share units:
 Number of restricted shares and restricted
share units
Outstanding as of December 31, 2019636,146 
Granted608,695 
Issued(210,556)
Forfeited/canceled(155,764)
Outstanding as of December 31, 2020878,521 
Fair Value of Performance-based Awards
The following assumptions were used to determine the fair values for the performance-based awards that include both a performance condition and a market condition, and fair values for market-based awards as of the grant date for the years ended December 31:
 20202019
 Monte CarloBinomialMonte CarloBinomial
Risk-free interest rate (%)2.47 
0.09 – 0.27
2.47 — 
Expected stock price volatility (%)17.72 80.36 58.90 — 
Expected dividend yield— — — — 
Expected life (in years)3230
Fair value$— $12.58 $20.54 $—