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Share Based Compensation Plans (Tables)
 3 Months Ended
Apr. 01, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock appreciation rights award activity
Three Months Ended April 1, 2018
Stock Appreciation Rights
 
Aggregate Intrinsic Value (in thousands)
 
 Weighted Average Exercise Price
 
 Average Remaining Contractual Life (Years)
Outstanding, beginning of period
537,930

 
$
23,263

 
$
32.00

 
4.5
Granted
69,752

 

 
65.00

 
 
Exercised
(17,174
)
 
848

 
20.98

 
 
Outstanding, end of period
590,508

 
$
15,895

 
$
36.22

 
5.0
 
 
 
 
 
 
 
 
Exercisable, end of period
467,623

 
$
15,834

 
$
28.11

 
3.8
Three Months Ended April 2, 2017
Stock Appreciation Rights
 
Aggregate Intrinsic Value (in thousands)
 
 Weighted Average Exercise Price
 
 Average Remaining Contractual Life (Years)
Outstanding, beginning of period
790,290

 
$
32,659

 
$
24.47

 
4.6
Granted
59,265

 
 
 
77.00

 
 
Exercised
(181,965
)
 
10,846

 
19.04

 
 
Forfeited
(9,019
)
 
 
 
65.21

 
 
Outstanding, end of period
658,571

 
$
32,339

 
$
30.15

 
5.0
 
 
 
 
 
 
 
 
Exercisable, end of period
556,388

 
$
31,248

 
$
23.09

 
4.2
Schedule of Share-based Compensation, Stock Appreciation Rights, Valuation Assumptions
The weighted average grant date assumptions used for the SARs granted were as follows for the periods indicated:
 
2018 Grants
 
2017 Grants
SAR value (model conclusion)
$
18.63

 
$
22.65

Risk-free rate
2.7
%
 
2.0
%
Expected dividend yield
0.0
%
 
0.0
%
Expected volatility
22.8
%
 
25.8
%
Expected term (years)
6.0

 
6.0
Restricted stock units award activity
 
Three Months Ended
 
April 1, 2018
 
April 2, 2017
 
Total Restricted Stock Units Outstanding
 
Weighted Average Grant Date Fair Value
 
Total Restricted Stock Units Outstanding
 
Weighted Average Grant Date Fair Value
Outstanding, beginning of period
417,598

 
$
66.14

 
501,926

 
$
58.51

Granted
252,740

 
62.74

 
226,808

 
70.60

Delivered
(152,743
)
 
 
 
(176,077
)
 
 
Withheld to cover (1)
(41,557
)
 
 
 
(54,614
)
 
 
Forfeited
(6,211
)
 
 
 
(30,664
)
 
 
Outstanding, end of period
469,827

 
$
65.70

 
467,379

 
$
65.72

____________
(1) A portion of the vested RSUs delivered were net share settled to cover statutory requirements for income and other employment taxes. We remit the equivalent cash to the appropriate taxing authorities. These net share settlements had the effect of share repurchases by us as we reduced and retired the number of shares that would have otherwise been issued as a result of the vesting.