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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] The following weighted average assumptions were used for stock options granted during 2020, 2019 and 2018:
202020192018
Volatility
33.9% to 56.7%
32.0% to 39.6%
25.1% to 33.2%
Risk free interest rate
0.2% to 1.6%
1.6% to 2.5%
2.1% to 2.9%
Expected life in years
3.0 to 5.0
1.0 to 5.0
3.0 to 5.0
Dividend yield1.2%1.6%1.7%
Weighted average fair value$10.15$5.38$6.75
Schedule Of Share Based Compensation Shares Authorized Under Stock Plans Issued And Avaliability
Common stock authorized11,000,000 
Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled awards(2,126,956)
Common stock available for grant of stock-based awards as of December 31, 20208,873,044 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
For the years ended December 31, 2020, 2019 and 2018, total equity-based compensation was as follows:

Years Ended December 31,
202020192018
Restricted stock$18,740 $19,143 $16,720 
Stock options3,899 4,027 4,356 
Total$22,639 $23,170 $21,076 
Schedule of Share-based Compensation, Stock Options, Activity
Activity relating to stock options granted under the Company’s plans during the three years ended December 31, 2020 is as follows:

Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual TermAggregate Intrinsic Value
Outstanding at January 1, 20182,846,000 $23.87 
Granted585,000 32.39 
Exercised(593,000)22.04 
Forfeited(23,000)22.59 
Outstanding at December 31, 20182,815,000 26.03 
Granted272,000 30.93 
Exercised(273,000)22.77 
Forfeited(12,000)20.17 
Outstanding at December 31, 20192,802,000 26.85 
Granted509,000 34.40 
Exercised(80,000)21.57 
Forfeited(557,000)34.74 
Outstanding at December 31, 20202,674,000 $26.80 3.2$23,278 
Exercisable at December 31, 20201,928,000 $26.89 3.0$16,416 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes information about stock options at December 31, 2020:

Options OutstandingOptions Exercisable
Range of Exercise PriceNumber OutstandingWeighted Average Remaining Contractual Life (in Years)Weighted Average Exercise PriceNumber ExercisableWeighted Average Exercise Price
$20.15 to $24.72465,000 1.5$23.30400,000 $23.22
$24.73 to $29.301,605,000 3.325.181,031,000 25.33
$29.31 to $33.88290,000 5.330.45252,000 30.26
$33.89 to $38.47263,000 2.735.85242,000 35.90
$38.48 to $43.0551,000 5.842.143,000 41.18
2,674,000 3.2$26.801,928,000 $26.89
Schedule of Nonvested Share Activity
The following table summarizes restricted stock activity during the three years ended December 31, 2020:

Number of SharesWeighted Average Fair Value at Grant Date
Outstanding at January 1, 20185,876,000 $17.37 
Granted509,000 31.70 
Vested(1,177,000)18.44 
Forfeited(71,000)25.61 
Outstanding at December 31, 20185,137,000 18.42 
Granted633,000 32.64 
Vested(1,200,000)19.40 
Forfeited(143,000)28.61 
Outstanding at December 31, 20194,427,000 19.84 
Granted561,000 30.35 
Vested(1,189,000)19.96 
Forfeited(148,000)34.89 
Outstanding at December 31, 20203,651,000 $20.81 
Schedule of cash proceeds and intrinsic values for stock options exercised table text block
Stock Options

Cash proceeds and intrinsic values related to total stock options exercised during December 31, 2020, 2019 and 2018 are as follows:

Years Ended December 31,
202020192018
Proceeds from stock options exercised$1,609 $6,212 $13,036 
Intrinsic value of stock options exercised$993 $4,268 $6,841