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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Valuation Assumptions The following table includes the weighted- average assumptions used in estimating the fair values and the resulting weighted-average fair value of stock options granted in the periods presented:
Year Ended December 31,
202020192018
Weighted average fair values of stock options granted$15.58 $12.68 $11.80 
Expected volatility64.7 %36.0 %35.7 %
Expected dividends.84 %.65 %.70 %
Weighted average risk-free interest rate.24 %1.72 %2.47 %
Expected life of stock options (in years)3.53.53.5
Schedule of Stock Options Activity A summary of stock option activity for the years ended December 31, 2020, 2019, and 2018 is as follows:
SharesWeighted
Average
Exercise Price		Weighted
Average
Remaining
Contractual
Term (Years)		Aggregate Intrinsic
Value
    (In thousands)
Outstanding at January 1, 2018147,999 $37.68 2.94$6,152 
Granted42,000 $42.56   
Exercised(27,999)$15.65   
Canceled— $—   
Outstanding at December 31, 2018162,000 $42.75 3.05$— 
Granted66,000 $46.75 
Exercised— $— 
Canceled(10,125)$46.66 
Outstanding at December 31, 2019217,875 $43.78 2.60$— 
Granted36,000 $35.70 
Exercised(30,000)$21.19 
Canceled(6,000)$28.59 
Outstanding at December 31, 2020217,875 $45.97 2.57$— 
Exercisable at December 31, 2020115,125 $49.17 1.63$— 
Schedule of Nonvested Share Activity A summary of non-vested options and changes for the years ended December 31, 2020, 2019 and 2018 is as follows:
Non-Vested Number of SharesWeighted
Average
Exercise Price
   
Non-vested balance at January 1, 201876,500 $47.99 
Granted42,000 $42.56 
Vested(36,750)$43.52 
Canceled— $— 
Non-vested balance at December 31, 201881,750 $47.21 
Granted66,000 $46.75 
Vested(28,875)$48.46 
Canceled(10,125)$46.66 
Non-vested balance at December 31, 2019108,750 $46.65 
Granted36,000 $35.70 
Vested(42,000)$47.66 
Canceled— $— 
Non-vested balance at December 31, 2020102,750 $42.40 
Schedule of Shares Authorized under Stock Option Plans, by Exercise Price Range The following table summarizes information about stock options outstanding by price range as of December 31, 2020:
Options OutstandingOptions Exercisable
Exercise PricesNumber OutstandingWeighted-Average Remaining Contractual Life (Years)Weighted-Average Exercise PriceNumber of SharesWeighted-Average Exercise Price
$35.7036,000 0.82$5.90 — $— 
$41.6036,000 0.45$6.87 11,250 $4.07 
$42.5636,000 0.50$7.03 18,000 $6.65 
$49.2240,875 0.06$9.23 40,875 $17.48 
$52.9230,000 0.47$7.29 11,250 $5.17 
$53.9039,000 0.27$9.65 33,750 $15.80 
217,875 2.57$45.97 115,125 $49.17 
Schedule of Nonvested Restricted Stock Activity A summary of the status of the Company’s non-vested restricted stock grant shares is presented in the following table:
SharesWeighted-Average Grant Date
Fair Value
Non-vested at January 1, 2018107,095 $45.74 
Granted5,623 $76.47 
Vested(68,788)$40.67 
Forfeited(3,514)$46.24 
Non-vested at December 31, 201840,416 $58.60 
Granted91,658 $50.54 
Vested(24,120)$57.14 
Forfeited— $— 
Non-vested at December 31, 2019107,954 $52.08 
Granted388,089 $24.37 
Vested(68,504)$52.49 
Forfeited— $— 
Non-vested at December 31, 2020427,539 $26.86