Annual report pursuant to Section 13 and 15(d)

Stock Plans and Management Compensation (Details 1)

v3.22.0.1
Stock Plans and Management Compensation (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Available for Grant (in shares) 5,000    
Non-Vested Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of Grantee   62 years  
Share-Based Compensation Expense $ 16,300 $ 13,300 $ 10,900
Share-Based Compensation Expense, Tax Benefit 4,000 3,300 2,700
Fair Value of Shares Vested During the Period $ 11,300 $ 6,600 $ 19,200
Weighted Average Grant Date Fair Value $ 66.81 $ 57.31  
Awarded - Weighted Average Grant Date Fair Value 91.14 $ 64.13 $ 49.12
Forfeited - Weighted Average Grant Date Fair Value 66.39    
Vested - Weighted Average Grant Date Fair Value $ 59.71    
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1 571    
Awarded 190    
Forfeited (14)    
Vested (112)    
Outstanding at December 31 635 571  
Unrecognized Compensation Cost $ 12,000    
Non-Vested Stock Awards [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of Grantee plus Grantees Total Number of Years of Service 70 years    
Stock Options and SAR's [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of Grantee   62 years  
SARs/Stock Options Outstanding [Roll Forward]      
Outstanding on January 1 22 119 343
Exercised (16) (97) (224)
Forfeited 0 0 0
Outstanding on December 31 6 22 119
Exercisable and Vested on December 31 6 22 119
Weighted Average Exercise Price [Abstract]      
Outstanding on January 1 $ 23.41 $ 21.57 $ 16.04
Exercised 23.28 21.16 13.13
Forfeited 0 11.08 5.86
Outstanding on December 31 23.79 23.41 21.57
Exercisable and Vested on December 31 $ 23.79 $ 23.41 $ 21.57
Aggregate Intrinsic Value [Abstract]      
Exercised $ 1,255 $ 5,353 $ 10,494
Outstanding on December 31 1,693 6,276 4,571
Exercisable and Vested on December 31 $ 1,693 6,276 4,571
Stock Options and SAR's [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of Grantee plus Grantees Total Number of Years of Service 70 years    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Expense $ 13,500 13,800 6,400
Share-Based Compensation Expense, Tax Benefit 3,300 3,400 1,600
Fair Value of Shares Vested During the Period $ 18,600 $ 3,400 $ 4,900
Weighted Average Grant Date Fair Value $ 76.15 $ 55.71  
Awarded - Weighted Average Grant Date Fair Value 76.89    
Forfeited - Weighted Average Grant Date Fair Value 87.48    
Vested - Weighted Average Grant Date Fair Value $ 53.35    
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1 212    
Awarded 166    
Forfeited (1)    
Vested (185)    
Outstanding at December 31 192 212  
Unrecognized Compensation Cost $ 6,400