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Share-Based Compensation
9 Months Ended
Sep. 30, 2012
Text Block [Abstract]  
Share-Based Compensation
Share-Based Compensation
For the three and nine months ended September 30, 2012 and 2011, we recorded share-based compensation and related tax benefits as follows: 
 
 
Three months ended September 30,
 
Nine months ended September 30,
(Dollars in thousands)
 
2012
 
2011
 
2012
 
2011
Share-based compensation expense
 
$
5,617

 
$
4,552

 
$
16,594

 
$
13,501

Income tax benefit related to share-based compensation expense
 
(1,720
)
 
(1,256
)
 
(4,408
)
 
(3,532
)

Unrecognized Compensation Expense
As of September 30, 2012, unrecognized share-based compensation expense was as follows:
(Dollars in thousands)
 
  Unrecognized  
Expense
 
Average
Expected
Recognition
  Period - in Years  
Stock options
 
$
17,308

 
2.80
Restricted stock units
 
26,662

 
2.81
Total unrecognized share-based compensation expense
 
$
43,970

 
 

Share-Based Payment Award Activity
The table below provides stock option information related to the 1997 Equity Incentive Plan and the 2006 Equity Incentive Plan for the nine months ended September 30, 2012:
 
 
Options
 
Weighted
Average
 Exercise Price 
 
Weighted
Average
Remaining
Contractual
  Life in Years  
 
Aggregate
  Intrinsic Value  
of In-The-
Money
Options
Outstanding at December 31, 2011
 
2,439,360

 
$
42.64

 
 
 
 
Granted
 
395,563

 
63.90

 
 
 
 
Exercised
 
(680,929
)
 
35.28

 
 
 
 
Forfeited
 
(56,996
)
 
47.90

 
 
 
 
Expired
 
(4,568
)
 
42.50

 
 
 
 
Outstanding at September 30, 2012
 
2,092,430

 
48.91

 
4.14
 
$
25,582,079

Vested and expected to vest at September 30, 2012
 
2,003,907

 
48.50

 
4.07
 
25,221,007

Exercisable at September 30, 2012
 
1,088,716

 
44.35

 
2.88
 
17,542,729


The aggregate intrinsic value of outstanding options shown in the table above represents the pretax intrinsic value based on our closing stock price of $60.46 as of September 30, 2012. The total intrinsic value of options exercised during the three and nine months ended September 30, 2012 was $3.0 million and $16.7 million, respectively, compared to $3.2 million and $19.0 million for the comparable 2011 periods.
The table below provides information for restricted stock units under the 2006 Equity Incentive Plan for the nine months ended September 30, 2012:
 
 
Shares    
 
Weighted
Average
    Grant Date Fair    
Value
Nonvested at December 31, 2011
 
499,119

 
$
52.72

Granted
 
313,040

 
63.83

Vested
 
(144,953
)
 
51.25

Forfeited
 
(26,700
)
 
54.89

Nonvested at September 30, 2012
 
640,506

 
58.39