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Share-based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 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
(470,374
)
 
23.77

 
—

 
—

Forfeitures
(225
)
 
27.44

 
—

 
—

Outstanding at June 30, 2014
1,222,584

 
$
41.72

 
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
June 30
 
Six Months Ended
June 30
 
2014
 
2013
 
2014
 
2013
Restricted stock
$
(3,727
)
 
$
(3,121
)
 
$
(7,048
)
 
$
(6,758
)
Performance units
(286
)
 
(16
)
 
(553
)
 
(16
)
Impact on income before income taxes
(4,013
)
 
(3,137
)
 
(7,601
)
 
(6,774
)
Income tax benefit
1,562

 
1,219

 
2,958

 
2,631

Impact on net income
$
(2,451
)
 
$
(1,918
)
 
$
(4,643
)
 
$
(4,143
)
Unrecognized Compensation For Restricted Stock and Performance Units
The unrecognized compensation expense for all share-based awards at June 30, 2014, is as follows (dollars in thousands):
 
June 30, 2014
 
Unrecognized Compensation Expense
 
Remaining Weighted Average Recognition Period (in years)
Restricted stock
$
33,901

 
2.9
Performance units
6,546

 
3.6
Total unrecognized share-based compensation expense
$
40,447

 
3.0