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Stockholders' Equity Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
A summary of the stock options at and changes during the three years ended December 31, 2020 is presented in the table and narrative below (shares in thousands): 
 Years Ended December 31,
 201820192020
SharesWtd. Avg.
Ex. Price
SharesWtd. Avg.
Ex. Price
SharesWtd. Avg.
Ex. Price
Outstanding at January 1, 20201,934 $20.85 1,523 $21.95 1,078 $23.22 
Granted213 $25.43 100 $24.35 20 $18.02 
Exercised (1)
(459)$17.73 (247)$17.37 (40)$13.72 
Cancelled or expired(165)$25.34 (298)$21.96 (146)$23.97 
Outstanding at December 31, 20201,523 $21.95 1,078 $23.22 912 $23.40 
Exercisable at December 31, 20201,001 $20.29 643 $22.02 668 $22.90 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
The following table further describes our outstanding stock options at December 31, 2020:
 Options OutstandingOptions Exercisable
Actual Ranges of Exercise PricesNumber Outstanding at 12/31/20Weighted-Average
Remaining
Contractual Life
Weighted-Average
Exercise Price
Number Exercisable at 12/31/20Weighted-Average
Remaining
Contractual Life
Weighted-Average
Exercise Price
$5.94 - $5.9422,674 1.18$5.94 22,674 1.18$5.94 
$18.02 - $22.58461,472 2.41$21.68 415,432 2.14$21.96 
$25.43 - $26.54427,590 6.50$26.19 229,776 6.43$26.28 
$5.94 - $26.54911,736 4.30$23.40 667,882 3.58$22.90 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity In 2019, a total of 25,550 shares of restricted stock were awarded with a grant date market value of $0.5 million. In 2018, a total of 86,260 shares of restricted stock were awarded with a grant date market value of $2.2 million.
A summary of the status of unvested restricted stock as of December 31, 2020, and changes during 2020, is presented below: 
Restricted stock awardsSharesWeighted Average
Grant Date
Fair Value
Unvested at January 1, 202069,745 $23.56 
Granted 10,200 25.00 
Vested(34,815)24.26 
Cancelled— — 
Unvested at December 31, 202045,130 $23.34 
Schedule of Dividends Payable ur Board declared the following dividends payable on the dates below (in thousands, except per share amounts):
2020Per ShareDollar Value
March 1st$0.0750 $1,339 
June 1st$0.0750 $1,343 
September 1st$0.0875 $1,569 
December 1st$0.1000 $1,797 
2019Per ShareDollar Value
March 1st$0.0750 $1,360 
June 1st$0.0750 $1,365 
September 1st$0.0750 $1,336 
December 1st$0.0750 $1,337 
Employee Stock Option  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair values of our stock options were calculated using the following weighted average assumptions, based on the methods described above:
Years Ended December 31,
201820192020
Dividend yield1.18 %1.23 %1.67 %
Expected volatility27.08 %27.45 %38.54 %
Risk-free interest rate2.65 %1.65 %0.25 %
Expected holding period (years)5.05.03.7
Black-Scholes value$6.38$5.70$4.61
Employee Stock Purchase Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair values of the right to purchase shares under the ESPP are estimated at the date of purchase with the four quarterly purchase dates using the following assumptions:
Years Ended December 31,
201820192020
Dividend yield1.4 %1.4 %1.5 %
Expected volatility20.9 %36.1 %48.6 %
Risk-free interest rate
1.44%, 1.61%, 1.72%, 1.83%
2.42%, 2.51%, 2.56%, 2.60%
1.54%, 1.57%, 1.57%, 1.56%
Expected life (years)
0.25, 0.50, 0.75, 1.00
0.25, 0.50, .0.75, 1.00
0.25, 0.50, 0.75, 1.00