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Stock-Based Compensation Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Stock-Based Compensation [Abstract]  
Stock-based compensation expense [Table Text Block]
Stock-based compensation expense for the years ended December 31, 2020, 2019 and 2018 is as follows:
Year Ended December 31,
(In thousands)202020192018
Stock options$1,878 $1,273 $1,388 
Restricted share units10,406 5,685 4,573 
Total stock-based compensation expense12,284 6,958 5,961 
Tax benefit recognized in the statements of earnings3,062 1,562 1,739 
Stock-based compensation expense, net of tax$9,222 5,396 $4,222 
Stock option activity [Table Text Block]
Information with respect to stock option activity related to the Plans for the year ended December 31, 2020 follows:
Equity Awards
Outstanding
Weighted Average
Exercise Price
Weighted Average
Remaining Contractual Life
Aggregate Intrinsic
Value
(In thousands)
Balance outstanding at January 1, 20201,834,862 $21.70 
Granted463,124 25.32 
Exercised(496,018)20.63 
Forfeited(97,863)20.03 
Expired(45,940)29.63 
Balance outstanding at December 31, 20201,658,165 $22.91 6.39$25,957 
Exercisable at December 31, 2020752,200 $25.96 3.97$9,345 
Weighted average fair values of options granted [Table Text Block]
The weighted average fair values of the options granted under the Plans were calculated using the Black-Scholes method. The weighted average grant date fair value and weighted average assumptions used in the option pricing models are as follows: 
 Year Ended December 31,
 202020192018
Weighted average grant date fair value$7.28 $8.92 $3.80 
Weighted average risk free interest rate0.93 %2.07 %2.51 %
Weighted average expected dividend yield4.75 %1.28 %— %
Weighted average expected volatility49.44 %50.93 %49.58 %
Weighted average expected life (in years)4.624.634.63
Nonvested restricted stock units activity [Table Text Block]
Information with respect to non-vested restricted stock unit activity follows:
Restricted Awards
Outstanding
Weighted Average
Grant Date Fair Value
Balance outstanding at January 1, 20201,570,400 $14.38 
Granted600,449 27.79 
Vested(667,233)10.18 
Forfeited(119,665)18.98 
Balance outstanding at December 31, 20201,383,951 $20.09