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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Income Per Common Share
The following table sets forth the computation of basic and diluted income per common share for the periods presented (dollars and shares in thousands, except per share data).
 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Net income
$
99,557

 
$
66,252

 
$
189,643

 
$
128,546

Less: distributed and undistributed earnings allocated to participating securities
(1,514
)
 
—

 
(2,918
)
 
—

Net income attributable to common shareholders
$
98,043

 
$
66,252

 
$
186,725

 
$
128,546

Denominator:
 
 
 
 
 
 
 
Weighted average basic common shares outstanding
96,906

 
96,432

 
96,847

 
96,424

Effect of dilutive securities
8

 
1,062

 
34

 
1,037

Diluted common shares outstanding
96,914

 
97,494

 
96,881

 
97,461

Basic income per common share
$
1.01

 
$
0.69

 
$
1.93

 
$
1.33

Diluted income per common share
$
1.01

 
$
0.68

 
$
1.93

 
$
1.32