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Share-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
Share-based Compensation [Abstract]  
Summary of Restricted Stock and Performance Unit Award Activity
The following table presents restricted stock and performance unit award activity for the three months ended March 31, 2014:
 
Restricted Stock
 
Performance Units
 
Shares
 
Weighted Average Grant- Date Fair Value
 
Shares
 
Weighted Average Grant- Date Fair Value
Outstanding at December 31, 2013
1,463,694

 
$
31.48

 
70,600

 
$
47.83

Granted
33,714

 
65.29

 
—

 
—

Vested
(72,533
)
 
29.03

 
—

 
—

Outstanding at March 31, 2014
1,424,875

 
$
32.40

 
70,600

 
$
47.83
Compensation Expense for Restricted Stock and Performance Units
Compensation expense for share-based awards recognized in the Consolidated Statements of Income, net of forfeitures was as follows (dollars in thousands):
 
Three Months Ended
March 31
 
2014
 
2013
Restricted stock
$
(3,321
)
 
$
(3,637
)
Performance units
(267
)
 
—

Impact on income before income taxes
(3,588
)
 
(3,637
)
Income tax benefit
1,396

 
1,413

Impact on net income
$
(2,192
)
 
$
(2,224
)
Unrecognized Compensation For Restricted Stock and Performance Units
The unrecognized compensation expense for all share-based awards at March 31, 2014, is as follows (dollars in thousands):
 
March 31, 2014
 
Unrecognized Compensation Expense
 
Remaining Weighted Average Recognition Period (in years)
Restricted stock
$
23,513

 
2.6
Performance units
2,730

 
3.3
Total unrecognized share-based compensation expense
$
26,243

 
2.7