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STOCK COMPENSATION
9 Months Ended
Sep. 30, 2013
STOCK COMPENSATION [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 nine months ended September 30, 2013 and 2012:
 
Three Months Ended
 
Nine Months Ended
(in thousands)
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
Stock option expense
$
2,565

 
$
3,027

 
$
7,570

 
$
8,706

RSU expense
3,077

 
2,839

 
8,637

 
7,480

Total stock based compensation expense
$
5,642

 
$
5,866

 
$
16,207

 
$
16,186

 
 
 
 
 
 
 
 
Total related tax benefit
$
1,590

 
$
1,692

 
$
4,250

 
$
4,406



At September 30, 2013, the remaining unamortized compensation cost related to non-qualified stock options is $13.1 million, which will be expensed over the weighted average remaining vesting period of the options, or 1.5 years. At September 30, 2013, the unamortized compensation cost related to RSU is $20.8 million, which will be expensed over the weighted average remaining restricted period of the RSU, or 1.5 years.

The following table reflects the non-qualified stock option transactions from December 31, 2012 through September 30, 2013:
 
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, 2012
9,906

 
$
33.18

 
$
69,079

 
7,599

 
$
31.79

 
$
64,819

Granted
922

 
40.93

 
 

 
 

 
 

 
 

Exercised
(1,707
)
 
28.32

 
 

 
 

 
 

 
 

Cancelled
(34
)
 
42.82

 
 

 
 

 
 

 
 

Forfeited
(133
)
 
38.88

 
 

 
 

 
 

 
 

Balance at September 30, 2013
8,954

 
$
34.79

 
$
78,895

 
6,810

 
$
33.41

 
$
69,780



At September 30, 2013, the weighted average remaining contractual term of all outstanding options is 5.8 years and the weighted average remaining contractual term of exercisable options is 4.9 years.

The following table summarizes the unvested RSU transactions from December 31, 2012 through September 30, 2013:
(in thousands, except per share data)
Shares
 
Weighted Average
Grant Date
Fair Value
 
 
 
 
Balance at December 31, 2012
1,034

 
$
36.34

Granted
505

 
40.91

Vested
(243
)
 
32.71

Forfeited
(128
)
 
38.82

Balance at September 30, 2013
1,168

 
$
38.80