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Share Based Compensation Plans (Tables)
 9 Months Ended
Oct. 01, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock appreciation rights award activity
Nine Months Ended October 1, 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
(226,468
)
 
13,122

 
18.98

 
 
Forfeited
(29,082
)
 
 
 
53.43

 
 
Outstanding, end of period
594,005

 
$
23,851

 
$
30.39

 
4.6
 
 
 
 
 
 
 
 
Exercisable, end of period
509,674

 
$
23,387

 
$
23.31

 
3.8
Nine Months Ended October 2, 2016
Stock Appreciation Rights
 
Aggregate Intrinsic Value (in thousands)
 
 Weighted Average Exercise Price
 
 Average Remaining Contractual Life (Years)
Outstanding, beginning of period
891,147

 
$
36,681

 
$
20.07

 
4.9
Granted
121,805

 
 
 
58.37

 
 
Exercised
(164,616
)
 
8,454

 
16.92

 
 
Forfeited
(2,400
)
 
 
 
32.68

 
 
Outstanding, end of period
845,936

 
$
30,462

 
$
26.16

 
5.0
 
 
 
 
 
 
 
 
Exercisable, end of period
720,311

 
$
29,948

 
$
20.59

 
4.3
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:
 
2017 Grants
 
2016 Grants
SAR value (model conclusion)
$
22.65

 
$
16.78

Risk-free rate
2.0
%
 
1.6
%
Expected dividend yield
0.0
%
 
0.0
%
Expected volatility
25.8
%
 
26.2
%
Expected term (years)
6.0

 
6.0
Restricted stock units award activity
 
Nine Months Ended
 
October 1, 2017
 
October 2, 2016
 
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
501,926

 
$
58.51

 
526,930

 
$
49.31

Granted
240,771

 
70.67

 
288,383

 
46.04

Delivered
(187,333
)
 
 
 
(228,158
)
 
 
Withheld to cover (1)
(54,638
)
 
 
 
(59,374
)
 
 
Forfeited
(60,763
)
 
 
 
(11,930
)
 
 
Outstanding, end of period
439,963

 
$
66.03

 
515,851

 
$
58.59

____________
(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.