Annual report pursuant to Section 13 and 15(d)

Stock Plans and Management Compensation (Details 1)

v3.10.0.1
Stock Plans and Management Compensation (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Available for Grant (in shares) 5,200    
Non-Vested Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards Vesting Period (in years) 3 years    
Age of Grantee 62 years    
Share-Based Compensation Expense $ 13,200 $ 11,600 $ 10,800
Share-Based Compensation Expense, Tax Benefit 3,300 4,400 4,100
Fair Value of Shares Vested During the Period $ 4,400 $ 12,100 $ 13,800
Weighted Average Grant Date Fair Value $ 54.82 $ 51.69  
Awarded - Weighted Average Grant Date Fair Value 59.05 $ 60.30 $ 40.01
Forfeited - Weighted Average Grant Date Fair Value 55.30    
Vested - Weighted Average Grant Date Fair Value $ 57.99    
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1 376    
Awarded 357    
Forfeited (64)    
Vested (95)    
Outstanding at December 31 574 376  
Unrecognized Compensation Cost $ 11,700    
Unrecognized Compensation Cost, Period for Recognition 1 year 4 months 24 days    
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    
Stock Options and SAR's [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards Vesting Period (in years) 4 years    
Age of Grantee 62 years    
SARs/Stock Options Outstanding [Roll Forward]      
Outstanding on January 1 594 978 2,234
Exercised (248) (352) (1,252)
Forfeited (3) (32) (4)
Outstanding on December 31 343 594 978
Exercisable on December 31 343 594 978
Vested and Expected to Vest on December 31 343 594 978
Weighted Average Exercise Price [Abstract]      
Outstanding on January 1 $ 14.40 $ 14.43 $ 15.78
Exercised 12.10 14.37 16.76
Forfeited 17.06 15.76 38.42
Outstanding on December 31 16.04 14.40 14.43
Exercisable on December 31 16.04 14.40 14.43
Vested and Expected to Vest on December 31 $ 16.04 $ 14.40 $ 14.43
Weighted Average Remaining Contractual Term [Abstract]      
Outstanding on December 31 1 year 8 months 12 days    
Exercisable on December 31 1 year 8 months 12 days    
Vested and Expected to Vest on December 31 1 year 8 months 12 days    
Aggregate Intrinsic Value [Abstract]      
Exercised $ 12,636 $ 16,071 $ 32,096
Outstanding on December 31 10,439 24,261 39,228
Exercisable on December 31 10,439 24,261 39,228
Vested and Expected to Vest on December 31 $ 10,439 24,261 39,228
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    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Expense $ 5,900 6,700 6,100
Share-Based Compensation Expense, Tax Benefit 1,500 2,600 2,300
Fair Value of Shares Vested During the Period $ 7,800 $ 5,500 $ 9,100
Weighted Average Grant Date Fair Value $ 61.32 $ 50.69  
Awarded - Weighted Average Grant Date Fair Value 59.11    
Forfeited - Weighted Average Grant Date Fair Value 59.07    
Vested - Weighted Average Grant Date Fair Value $ 52.79    
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1 102    
Awarded 176    
Forfeited (20)    
Vested (167)    
Outstanding at December 31 91 102  
Unrecognized Compensation Cost $ 2,800    
Unrecognized Compensation Cost, Period for Recognition 1 year 6 months