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STOCK COMPENSATION
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
STOCK COMPENSATION
STOCK COMPENSATION

The following table represents total stock based compensation expense for non-qualified stock options, restricted stock units (“RSU”) and the tax related benefit for the three and six months ended June 30, 2014 and 2013:
 
Three Months Ended
 
Six Months Ended
(in thousands)
2014
 
2013
 
2014
 
2013
 
 
 
 
 
 
 
 
Stock option expense
$
2,829

 
$
2,876

 
$
4,503

 
$
5,005

RSU expense
4,366

 
3,337

 
8,085

 
6,269

Total stock based compensation expense
$
7,195

 
$
6,213

 
$
12,588

 
$
11,274

 
 
 
 
 
 
 
 
Total related tax benefit
$
1,979

 
$
1,788

 
$
3,543

 
$
2,865



At June 30, 2014, the remaining unamortized compensation cost related to non-qualified stock options is $13.6 million, which will be expensed over the weighted average remaining vesting period of the options, or approximately 1.8 years. At June 30, 2014, the unamortized compensation cost related to RSU is $27.4 million, which will be expensed over the weighted average remaining restricted period of the RSU, or approximately 1.6 years.

The following table reflects the non-qualified stock option transactions from December 31, 2013 through June 30, 2014:
 
Outstanding
 
Exercisable
(in thousands, except per share data)
Shares
 
Weighted
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
 
Shares
 
Weighted
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2013
8,295

 
$
35.04

 
$
111,450

 
6,225

 
$
33.67

 
$
92,200

Granted
920

 
45.23

 
 

 
 

 
 

 
 

Exercised
(390
)
 
32.63

 
 

 
 

 
 

 
 

Cancelled
(5
)
 
45.15

 
 

 
 

 
 

 
 

Forfeited
(24
)
 
41.01

 
 

 
 

 
 

 
 

Balance at June 30, 2014
8,796

 
$
36.20

 
$
98,117

 
6,906

 
$
34.48

 
$
88,889



At June 30, 2014, the weighted average remaining contractual term of all outstanding options is approximately 5.7 years and the weighted average remaining contractual term of exercisable options is approximately 4.8 years.


The following table summarizes the unvested RSU transactions from December 31, 2013 through June 30, 2014:
(in thousands, except per share data)
Shares
 
Weighted Average
Grant Date
Fair Value
 
 
 
 
Balance at December 31, 2013
1,131

 
$
38.81

Granted
443

 
45.16

Vested
(272
)
 
36.69

Forfeited
(97
)
 
40.88

Balance at June 30, 2014
1,205

 
$
41.45