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Share-based compensation plans (restricted stock units, restricted shares and performance share awards) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted stock units [Member]      
Changes in share-based compensation awards (in thousands)      
Outstanding, beginning of year 167 166 150
Granted 38 34 30
Vested (46) (30) (13)
Forfeited (20) (3) (1)
Outstanding, end of year 139 167 166
Weighted-average grant date fair value      
Outstanding, beginning of year $ 34.74 $ 30.51 $ 27.11
Granted 55.39 63.28 53.64
Vested 40.15 25.05 23.42
Forfeited 58.69 58.04 34.08
Outstanding, end of year $ 37.99 $ 34.74 $ 30.51
Additional disclosures      
Weighted-average remaining contractual term, outstanding, end of year 4 years 2 months 12 days    
Fair value, awards vested $ 2,805 $ 1,970 $ 654
Restricted stock units classified as liabilities [Member]      
Changes in share-based compensation awards (in thousands)      
Outstanding, end of year 24    
Additional disclosures      
Aggregate intrinsic value, outstanding, end of year $ 1,695    
Weighted-average remaining contractual term, outstanding, end of year 8 months    
Fair value per unit, end of year $ 71.61    
Cash payments to settle restricted stock units $ 140 $ 120 $ 25
Restricted shares [Member]      
Changes in share-based compensation awards (in thousands)      
Outstanding, beginning of year 170 120 21
Granted 97 72 121
Vested (22) (14) (11)
Forfeited (25) (8) (11)
Outstanding, end of year 220 170 120
Weighted-average grant date fair value      
Outstanding, beginning of year $ 56.35 $ 49.96 $ 35.24
Granted 56.22 66.99 51.08
Vested 56.63 50.72 37.06
Forfeited 56.86 58.58 48.14
Outstanding, end of year $ 56.43 $ 56.35 $ 49.96
Additional disclosures      
Weighted-average remaining contractual term, outstanding, end of year 1 year 1 month 6 days    
Fair value, awards vested $ 1,398 $ 925 $ 624
Performance share awards [Member]      
Assumptions, Monte Carlo simulation model      
Risk-free interest rate 0.90% 1.00% 0.70%
Dividend yield 2.30% 1.90% 2.40%
Expected volatility 22.70% 22.70% 30.50%
Changes in share-based compensation awards (in thousands)      
Outstanding, beginning of year 122 69 0
Granted 153 62 74
Forfeited (39) (9) (5)
Outstanding, end of year 236 122 69
Weighted-average grant date fair value      
Outstanding, beginning of year $ 58.13 $ 50.14  
Granted 52.75 67.09 $ 50.14
Forfeited 55.04 58.28 50.14
Outstanding, end of year $ 55.15 $ 58.13 $ 50.14
Additional disclosures      
Weighted-average remaining contractual term, outstanding, end of year 1 year 6 months