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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Compensation, Expense
The following table reflects the total share-based compensation expense amounts reported in the Consolidated Statements of Operations:
 Year Ended  December 31,
 202020192018
 (In thousands)
Cost of ATM operating revenues$1,488 $1,488 $788 
Selling, general, and administrative expenses20,776 19,474 14,872 
Total share-based compensation expense$22,264 $20,962 $15,660 
Share-based Compensation, Restricted Share Units
The number of the Company’s earned non-vested RSUs as of December 31, 2020, 2019, and 2018 and the changes during these years are presented below:
 Number of SharesWeighted Average Grant Date Fair Value
Non-vested RSUs as of January 1, 20181,006,009 $37.88 
Granted723,045 26.96 
Vested(657,814)38.67 
Forfeited(160,075)37.34 
Non-vested RSUs as of December 31, 2018911,165 28.74 
Granted268,360 32.29 
Vested(397,451)29.60 
Forfeited(39,722)31.13 
Non-vested RSUs as of December 31, 2019742,352 29.44 
Granted921,962 23.58 
Vested(519,583)27.65 
Forfeited(69,372)27.38 
Non-vested RSUs as of December 31, 20201,075,359 $25.41 
Share-based Compensation, Stock Options The number of the Company’s outstanding stock options as of December 31, 2020, 2019 and 2018 and the changes during these years are presented below:
 Number of SharesWeighted Average Exercise PriceAggregate Intrinsic ValueWeighted Average Remaining Contractual Term
(in thousands)
Options outstanding as of January 1, 20181,250 $9.69 
Granted234,959 22.31 
Exercised(1,250)9.69 
Options outstanding as of December 31, 2018234,959 $22.31 $867 9.25years
Granted145,221 31.99 
Options outstanding as of December 31, 2019380,180 $26.01 $7,087 8.60years
Granted233,888 20.92 
Exercised(17,856)22.31 
Forfeited(11,747)31.99 
Options outstanding as of December 31, 2020584,465 $23.96 $6,625 8.27years
Options vested and exercisable as of December 31, 2020189,228 $24.59 $2,027 7.47years
Share-based Compensation, Valuation Assumptions The value assumptions for the option awards granted in the years ended December 31, 2020, 2019 and 2018 are presented below:
Valuation assumptions:
Options Granted in 2020Options Granted in 2019Options Granted in 2018
Expected option term (in years)6.06.06.0
Expected stock price volatility44.68 %39.87 %33.02 %
Expected dividend yield— %— %— %
Risk-free interest rate0.51 %2.46 %2.62 %