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CAPITAL STOCK AND SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Stock Purchase Plan Activity
The following is a detail of the purchases that were made or pending Board of Director approval under the plan:
Employee Stock Purchase Plan Period
Shares Issued
 
Price
2015 and Prior
2,977,712

 
$
14.20

January 1, 2016 to March 31, 2016
13,850

 
41.09

April 1, 2016 to June 30, 2016
14,236

 
42.91

July 1, 2016 to September 30, 2016
16,520

 
40.32

October 1, 2016 to December 31, 2016
16,882

 
36.24

January 1, 2017 to March 31, 2017
13,244

 
43.43

April 1, 2017 to June 30, 2017
11,446

 
53.39

July 1, 2017 to September 30, 2017
12,276

 
47.57

October 1, 2017 to December 31, 2017
13,323

 
44.80

 
3,089,489

 
 
Schedule of Share-based Payment Award Valuation Assumptions
The fair value of the 2017 awards were estimated using the following assumptions:
 
 
Risk Free Rate
1.99% - 2.16%
Expected Volatility
50.18% - 51.81%
Expected Term
5.78 - 6.25 years
Weighted Average Fair Value
$28.02
Schedule of Stock Options Activity
The following table presents our stock option activity for 2017:
 
Number of
Shares
 
Weighted
Average Exercise
Price
 
Weighted
Average Contractual
Life (Years)
Outstanding options at January 1, 2017
1,008,157

 
$
31.54

 
8.42
Granted
308,292

 
43.13

 
 
Exercised
(144,206
)
 
31.58

 
 
Canceled, forfeited or expired
(262,513
)
 
39.18

 
 
Outstanding options at December 31, 2017
909,730

 
$
33.25

 
7.62
Exercisable options at December 31, 2017
381,932

 
$
28.73

 
7.20
The following table presents our non-vested stock option award activity for 2017:
 
Number of
Shares
 
Weighted Average
Exercise Price
Non-vested stock options at January 1, 2017
726,699

 
$
32.58

Granted
308,292

 
43.13

Vested
(260,814
)
 
30.54

Forfeited
(246,379
)
 
39.48

Non-vested stock options at December 31, 2017
527,798

 
$
36.52
Schedule of Non-Vested Stock Activity
The following table presents our non-vested stock award activity for 2017:
 
Number of
Shares
 
Weighted Average
Grant Date Fair
Value
Non-vested stock at January 1, 2017
209,378

 
$
22.20

Granted
19,152

 
62.67

Vested
(170,292
)
 
21.61

Canceled, forfeited or expired
(11,240
)
 
19.51

Non-vested stock at December 31, 2017
46,998

 
$
41.48
Schedule of Non-Vested Stock Unit Activity
The following table presents our performance-based non-vested stock units activity for 2017:
 
Number of 
Shares
 
Weighted Average
Grant Date Fair
Value
Non-vested stock units at January 1, 2017
224,857

 
$
45.08

Granted
194,109

 
52.99

Vested
(73,998
)
 
45.23

Canceled, forfeited or expired
(92,020
)
 
47.50

Non-vested stock units at December 31, 2017
252,948

 
$
51.15

The following table presents our service-based non-vested stock units activity for 2017:
 
Number of 
Shares
 
Weighted Average
Grant Date Fair
Value
Non-vested stock units at January 1, 2017
249,429

 
$
42.05

Granted
126,447

 
53.79

Vested
(57,106
)
 
42.41

Canceled, forfeited or expired
(83,928
)
 
44.00

Non-vested stock units at December 31, 2017
234,842

 
$
47.58