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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Components of the stock-based compensation programs recorded as expense
The following table summarizes the components of the Company’s stock-based compensation programs recorded as expense ($ in thousands):
Years ended December 31,
2017
 
2016
 
2015
Time lapse restricted stock:
 

 
 

 
 

Pre-tax compensation expense
$
12,399

 
$
12,415

 
$
12,110

Tax benefit
(4,799
)
 
(4,805
)
 
(4,687
)
Restricted stock expense, net of tax
$
7,600

 
$
7,610

 
$
7,423
Summarized information on unvested restricted stock units outstanding
The following table summarizes information on unvested restricted stock units outstanding as of December 31, 2017, 2016 and 2015:
 
Number of Shares
(in thousands)
 
Weighted-Average
Grant-Date Fair
Value
Unvested Restricted Stock Grants
 

 
 

Unvested as of December 31, 2014
3,100

 
$
14.45

Forfeited
(85
)
 
15.71

Vested
(946
)
 
12.04

Granted
682

 
22.43

Unvested as of December 31, 2015
2,751

 
17.21

Forfeited
(114
)
 
19.54

Vested
(879
)
 
14.49

Granted
503

 
26.45

Unvested as of December 31, 2016
2,261

 
20.21

Forfeited
(34
)
 
22.38

Vested
(679
)
 
17.21

Granted
469

 
34.46

Unvested as of December 31, 2017
2,017

 
$
24.50