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STOCK-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity
The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and Directors Plan for the years ended December 31: 
 
 
Options
 
Weighted
Average
Exercise
Price
 
Weighted Average
Remaining
Contractual Life
 
Aggregate
Intrinsic value
(in thousands)
Outstanding at December 31, 2013
 
1,232,862

 
$
24.36

 
6.1
 
$
61,530

Granted
 
81,552

 
73.20

 
 
 
1,116

Exercised
 
(163,786
)
 
20.37

 
 
 
(10,895
)
Canceled
 
(3,070
)
 
52.73

 
 
 
(105
)
Outstanding at December 31, 2014
 
1,147,558

 
$
28.33

 
5.5
 
$
67,205

Granted
 
84,675

 
87.35

 
 
 
1,375

Exercised
 
(124,156
)
 
26.70

 
 
 
(5,516
)
Canceled
 
(10,754
)
 
65.22

 
 
 
(64
)
Outstanding at December 31, 2015
 
1,097,323

 
$
32.70

 
4.8
 
$
42,154

Granted
 
94,115

 
61.39

 
 
 
2,035

Exercised
 
(83,790
)
 
25.58

 
 
 
(4,813
)
Canceled
 
(8,825
)
 
71.47

 
 
 
(102
)
Outstanding at December 31, 2016
 
1,098,823

 
$
35.39

 
4.3
 
$
52,332

Exercisable at December 31, 2016
 
885,442

 
$
27.32

 
3.5
 
$
49,321
Stock Options Outstanding
Options outstanding at December 31, 2016 were as follows: 
 
 
Number of
Options
 
Weighted
Average
Exercise
Price of
Options
 
Weighted
Average
Remaining
Contractual
 
Number of
Options
Currently
 
Weighted Average
Exercise Price of
Options Currently
Range of exercise prices
 
Outstanding
 
Outstanding
 
Life
 
Exercisable
 
Exercisable
Under $15.00
 
198,000

 
$
14.50

 
2.1
 
198,000

 
$
14.50

15.00 - 23.00
 
310,149

 
18.29

 
1.9
 
310,149

 
18.29

23.00 - 30.00
 
145,779

 
28.74

 
3.8
 
145,779

 
28.74

30.00 - 38.00
 
105,924

 
35.25

 
5.1
 
105,924

 
35.25

Over 38.00
 
338,971

 
66.16

 
7.7
 
125,590

 
61.48

 
 
1,098,823

 
$
35.39

 
 
 
885,442

 
$
27.32
Schedule of Share-Based Fair Value of Each Option Grant Weighted-Average Assumptions
The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions: 
 
 
For the year ended
December 31,
 
 
2016
 
2015
 
2014
Dividend yield
 
0.26
%
 
0.14
%
 
0.11
%
Risk-free interest rate
 
1.5
%
 
1.8
%
 
2.2
%
Stock price volatility
 
26.9
%
 
27.3
%
 
33.0
%
Expected life (years)
 
5.0

 
5.0

 
5.0

Weighted average fair value of options granted during the year
 
$
14.96

 
$
24.41

 
$
22.82
Restricted Stock Activity and Incentive Stock Awards Activity
The following table summarizes the restricted stock activity and related information for the 2011 Plan, the 2000 Plan, and Directors Plan, and incentive stock units activity and related information for the 2011 Plan and the 2000 Plan with related information for the years ended December 31: 
 
 
Restricted
Stock
and Units
 
Incentive
Stock
Awards
 
Weighted
Average Grant
Date Fair
Value
Outstanding at December 31, 2013
 
510,129

 
1,043,594

 
$
35.27

Granted
 
150,886

 
140,240

 
73.68

Vested
 
(218,502
)
 
(458,536
)
 
29.83

Adjustment for incentive stock awards expected to vest
 
—

 
74,680

 
47.56

Canceled
 
(3,970
)
 
(8,370
)
 
48.50

Outstanding at December 31, 2014
 
438,543

 
791,608

 
$
47.97

Granted
 
113,945

 
126,050

 
87.90

Vested
 
(182,776
)
 
(433,932
)
 
37.76

Adjustment for incentive stock awards expected to vest
 
—

 
65,666

 
57.57

Canceled
 
(12,827
)
 
(7,754
)
 
67.05

Outstanding at December 31, 2015
 
356,885

 
541,638

 
$
65.89

Granted
 
212,600

 
167,850

 
66.03

Vested
 
(159,975
)
 
(236,591
)
 
51.80

Adjustment for incentive stock awards expected to vest
 
—

 
(38,164
)
 
74.42

Canceled
 
(13,215
)
 
(9,983
)
 
71.84

Outstanding at December 31, 2016
 
396,295

 
424,750

 
$
72.18