Annual report pursuant to Section 13 and 15(d)

Stock Plans and Management Compensation (Details 1)

v3.3.1.900
Stock Plans and Management Compensation (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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) 5,300    
SARs/Stock Options Outstanding [Roll Forward]      
Outstanding on January 1 2,700 3,800  
Outstanding on December 31 2,200 2,700 3,800
Exercisable on December 31 2,200 2,300 2,600
Non-Vested Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of grantee plus grantees total number of years of service 70    
Share-based compensation expense $ 13,600 $ 10,500 $ 10,100
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 53.77 $ 40.41 $ 34.64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1 880 815 798
Granted 258 322 298
Released (293) (220) (266)
Forfeited (11) (37) (15)
Outstanding at December 31 834 880 815
Unrecognized compensation cost $ 5,300    
Unrecognized compensation cost, period for recognition 1 year 1 month 16 days    
Aggregate Intrinsic Value [Abstract]      
Age of grantee 62 years    
Awards vesting period, other than options, lower range 3 years    
Awards vesting period, other than options, upper range 4 years    
Stock Options and SARs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 300 $ 1,300 $ 3,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Period for stock options and SARs to be exercisable (in years) 10 years    
Awards vesting period (in years) 4 years    
SARs/Stock Options Outstanding [Roll Forward]      
Outstanding on January 1 2,705 3,825 8,166
Granted 0 0 0
Exercised (464) (1,084) (4,156)
Forfeited (7) (36) (185)
Outstanding on December 31 2,234 2,705 3,825
Exercisable on December 31 2,151 2,294 2,607
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 2,234 2,705 3,825
Weighted Average Exercise Price [Abstract]      
Outstanding on January 1 $ 16.91 $ 19.09 $ 17.33
Granted 0.00 0.00 0.00
Exercised 22.15 24.02 14.80
Forfeited 29.99 35.10 37.38
Outstanding on December 31 15.78 16.91 19.09
Exercisable on December 31 15.47 16.03 19.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 15.78 $ 16.91 $ 19.09
Weighted Average Remaining Contractual Term [Abstract]      
Outstanding on December 31 4 years 1 month 6 days    
Exercisable on December 31 4 years 1 month 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 4 years 1 month 6 days    
Aggregate Intrinsic Value [Abstract]      
Exercised $ 14,615    
Outstanding on December 31 77,580    
Exercisable on December 31 75,372    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 77,580    
SARs modified on May 2009 and thereafter [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of grantee plus grantees total number of years of service 70    
Aggregate Intrinsic Value [Abstract]      
Age of grantee 62 years    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 8,000 $ 6,500 $ 5,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at January 1 376 249 96
Granted 167 152 153
Released (116) 0 0
Forfeited (3) (25) 0
Outstanding at December 31 424 376 249
Unrecognized compensation cost $ 1,600    
Unrecognized compensation cost, period for recognition 1 year 7 months 6 days