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Share-based Compensation (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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
229,489

 
70.24

 
56,889

 
71.19

Vested
(475,050
)
 
23.86

 
—

 
—

Forfeitures
(1,165
)
 
62.74

 
—

 
—

Outstanding at September 30, 2014
1,216,968

 
$
41.73

 
127,489

 
$
58.25
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
September 30
 
Nine Months Ended
September 30
 
2014
 
2013
 
2014
 
2013
Restricted stock
$
(3,453
)
 
$
(2,933
)
 
$
(10,501
)
 
$
(9,691
)
Performance units
(594
)
 
(249
)
 
(1,147
)
 
(265
)
Impact on income before income taxes
(4,047
)
 
(3,182
)
 
(11,648
)
 
(9,956
)
Income tax benefit
1,572

 
1,237

 
4,530

 
3,868

Impact on net income
$
(2,475
)
 
$
(1,945
)
 
$
(7,118
)
 
$
(6,088
)
Unrecognized Compensation For Restricted Stock and Performance Units
The unrecognized compensation expense for all share-based awards at September 30, 2014, was as follows (dollars in thousands):
 
September 30, 2014
 
Unrecognized Compensation Expense
 
Remaining Weighted Average Recognition Period (in years)
Restricted stock
$
30,543

 
2.7
Performance units
6,025

 
3.4
Total unrecognized share-based compensation expense
$
36,568

 
2.8