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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The Company uses the Black-Scholes option pricing model to determine the valuation of its options and has applied the following weighted average assumptions:
 
 
2017
 
2016
 
2015
Risk free rate
 
2.32
%
 
1.54
%
 
2.15
%
Estimated volatility
 
31.4
%
 
32.4
%
 
32.8
%
Expected term (in years)
 
10

 
10

 
10

Dividend yield
 
0
%
 
0
%
 
0
%
Forfeiture rate
 
0
%
 
0
%
 
0
%
Schedule of Share-based Compensation, Stock Options, Activity
Employee and director stock option activity during the years ended December 31, 2017, 2016 and 2015 was as follows: 
 
Number of
 options
 
Weighted
 average
 exercise
 price
 
Weighted
 average
 grant date
 fair value
 
Intrinsic value
($ in millions)
 
Weighted average remaining contractual term

Balance at December 31, 2014
1,116,308

 
$
17.58

 
$
7.73

 
$
16.8

 
3.0 years
Granted
40,683

 
26.67

 
12.29

 
 
 
 
Exercised
(250,000
)
 
11.10

 
5.57

 
$
4.8

 
 
Balance at December 31, 2015
906,991

 
19.78

 
8.53

 
$
2.6

 
2.9 years
Granted
57,386

 
19.87

 
8.71

 
 
 
 
Exercised
(421,000
)
 
12.53

 
6.44

 
$
3.1

 
 
Balance at December 31, 2016
543,377

 
25.40

 
10.17

 
$
0.5

 
4.7 years
Granted
522,250

 
21.25

 
9.63

 
 
 
 
Exercised
(50,000
)
 
19.60

 
10.18

 
$
0.1

 
 
Balance at December 31, 2017
1,015,627

 
$
23.55

 
$
9.89

 
$
—

 
6.9 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]
The following table summarizes information about options exercisable for the periods indicated:
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
Number of options exercisable
535,627

 
472,042

 
851,020

Weighted average exercise price
$
25.66

 
$
25.73

 
$
19.22

Weighted average remaining contractual term
4.6

 
4.1

 
2.6

Intrinsic value ($ in millions)
$
—

 
$
0.4

 
$
2.6
Restricted stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes the activity for unvested outstanding restricted share awards during the years ended December 31, 2017 and 2016:
 
 
Number of
non-vested
restricted
 shares
 
Weighted
 average
grant date
fair value
Balance at December 31, 2015
 
307,013

 
$
29.74

Granted
 
192,936

 
21.53

Vested
 
(122,620
)
 
25.66

Forfeited
 
(11,897
)
 
29.97

Balance at December 31, 2016
 
365,432

 
26.76

Granted
 
166,767

 
21.60

Vested
 
(153,746
)
 
28.97

Forfeited
 
(46,943
)
 
24.57

Balance at December 31, 2017
 
331,510

 
$
23.45
RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
 
 
Number of
non-vested
RSUs
 
Weighted
 average
grant date
fair value
Balance at December 31, 2015
 
22,170

 
$
30.55

Granted
 
7,444

 
21.56

Vested
 
(1,799
)
 
26.48

Forfeited
 
(11,881
)
 
29.60

Balance at December 31, 2016
 
15,934

 
27.52

Granted
 
11,559

 
21.65

Vested
 
(4,695
)
 
32.60

Balance at December 31, 2017
 
22,798

 
$
23.50