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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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
September 30
 
Nine Months Ended
September 30
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Net income
$
104,445

 
$
84,682

 
$
294,088

 
$
213,228

Less: distributed and undistributed earnings allocated to participating securities
(1,451
)
 
—

 
(4,381
)
 
—

Net income attributable to common shareholders
$
102,994

 
$
84,682

 
$
289,707

 
$
213,228

Denominator:
 
 
 
 
 
 
 
Weighted average basic common shares outstanding
97,165

 
96,758

 
96,954

 
96,536

Effect of dilutive securities
57

 
839

 
53

 
976

Diluted common shares outstanding
97,222

 
97,597

 
97,007

 
97,512

Basic income per common share
$
1.06

 
$
0.88

 
$
2.99

 
$
2.21

Diluted income per common share
$
1.06

 
$
0.87

 
$
2.99

 
$
2.19