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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Employee Equity-Based Compensation Expense
Year ended December 31,
(In millions)202020192018
Total stock-based compensation expense
(selling, general and administrative and other operating charges, net)
$10.5 $4.1 $3.3 
Income tax benefit related to stock-based compensation2.7 1.0 1.5 
Impact on cash flow due to taxes paid related to net share settlement of equity awards0.7 0.4 0.4 
Summary of Status of Outstanding RSU Awards A summary of the status of outstanding restricted stock units as of December 31, 2020, and changes during the year, is presented below:
 Time VestedPerformance-based
 SharesWeighted
Average
Grant Date
Fair Value
SharesWeighted Average Grant Date Fair Value
Restricted stock units, outstanding at December 31, 2019
190,190 $31.76 177,032 $29.09 
Granted377,822 23.46 120,382 27.67 
Vested(81,214)35.12 — — 
Forfeited / Canceled1
(61,546)26.41 (103,069)29.92 
Restricted stock units, outstanding at December 31, 2020
425,252 24.52 194,345 27.76 
Deferred shares, outstanding at December 31, 2020
33,663 7.31 — 
Total units outstanding at December 31, 2020
458,915 $23.26 194,345 27.76 
Assumption Used in Black-Scholes Option-Pricing Model to Estimate Fair Value of Stock Options
2018
VolatilityThe expected volatility is based upon Clearwater Paper's historical stock prices.35 %
Risk-free interest rateThe risk-free interest rate is based on constant maturity treasury rates with maturities matching the options' expected life on the grant date.2.74 %
Expected life-yearsThe expected life is the approximate mid-point between the expected vesting time and the remaining contractual life.6 years
Summary of Status of Outstanding Stock Option Awards and Changes During the Year
A summary of the status of outstanding stock option awards as of December 31, 2020, and changes during the year, is presented below:
SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Life (Years)Aggregate Intrinsic Value
Outstanding options at December 31, 2019656,374 $49.36 6.2$— 
Exercised(972)29.12 
Forfeited(23,164)37.49 
Expired(278,792)50.71 
Outstanding options at December 31, 2020353,446 $49.13 5.2$— 
Outstanding and exercisable options at December 31, 2020325,161 $50.16 5.0$—