Annual report pursuant to Section 13 and 15(d)

Stock Plans and Management Compensation (Details 1)

v3.6.0.2
Stock Plans and Management Compensation (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized Number of Shares (in shares) 5,000    
Number of Shares Available for Grant (in shares) 5,500    
Non-Vested Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards Vesting Period, Other than Options, Lower Range 3 years    
Awards Vesting Period, Other than Options, Upper Range 4 years    
Age of Grantee 62 years    
Share-Based Compensation Expense $ 10,800 $ 13,600 $ 10,500
Share-Based Compensation Expense, Tax Benefit 4,100 5,200 4,000
Fair Value of Shares Vested During the Period $ 13,800 $ 20,400 $ 14,100
Weighted Average Grant Date Fair Value $ 43.35 $ 44.46  
Awarded - Weighted Average Grant Date Fair Value 40.01 $ 53.77 $ 40.41
Forfeited - Weighted Average Grant Date Fair Value 42.11    
Vested - Weighted Average Grant Date Fair Value $ 40.48    
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1 322    
Awarded 332    
Forfeited (22)    
Vested (253)    
Outstanding at December 31 379 322  
Unrecognized Compensation Cost $ 6,500    
Unrecognized Compensation Cost, Period for Recognition 1 year 3 months 18 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]      
Age of Grantee 62 years    
Share-Based Compensation Expense $ 0 $ 300 $ 1,300
SARs/Stock Options Outstanding [Roll Forward]      
Outstanding on January 1 2,234 2,705 3,825
Exercised (1,252) (464) (1,084)
Forfeited (4) (7) (36)
Outstanding on December 31 978 2,234 2,705
Exercisable on December 31 978 2,151 2,294
Vested and Expected to Vest on December 31 978 2,234 2,705
Weighted Average Exercise Price [Abstract]      
Outstanding on January 1 $ 15.78 $ 16.91 $ 19.09
Exercised 16.76 22.15 24.02
Forfeited 38.42 29.99 35.10
Outstanding on December 31 14.43 15.78 16.91
Exercisable on December 31 14.43 15.47 16.03
Vested and Expected to Vest on December 31 $ 14.43 $ 15.78 $ 16.91
Weighted Average Remaining Contractual Term [Abstract]      
Outstanding on December 31 3 years 2 months 12 days    
Exercisable on December 31 3 years 2 months 12 days    
Vested and Expected to Vest on December 31 3 years 2 months 12 days    
Aggregate Intrinsic Value [Abstract]      
Exercised $ 32,096 $ 14,615 $ 23,611
Outstanding on December 31 39,228 77,580 92,908
Exercisable on December 31 39,228 75,372 80,809
Vested and Expected to Vest on December 31 $ 39,288 77,580 92,908
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 $ 6,100 8,000 6,500
Share-Based Compensation Expense, Tax Benefit 2,300 3,000 2,500
Fair Value of Shares Vested During the Period $ 9,100 $ 7,500 $ 7,400
Weighted Average Grant Date Fair Value $ 43.91 $ 49.39  
Awarded - Weighted Average Grant Date Fair Value 37.99    
Forfeited - Weighted Average Grant Date Fair Value 38.49    
Vested - Weighted Average Grant Date Fair Value $ 38.15    
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1 50    
Awarded 217    
Forfeited (9)    
Vested (167)    
Outstanding at December 31 91 50  
Unrecognized Compensation Cost $ 2,200    
Unrecognized Compensation Cost, Period for Recognition 1 year 7 months 6 days