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Net Income Per Share
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income Per Share
Basic EPS is computed based on the weighted average number of common shares (including restricted shares) issued and outstanding during the period. Diluted EPS is computed based on the weighted average number of common shares issued and outstanding plus equivalent shares, assuming the exercise of stock options. The dilutive effect of stock options is computed by application of the treasury-stock method. The following is a reconciliation between basic and diluted weighted average shares outstanding:
 
For the three months 
 ended June 30,
 
For the six months 
 ended June 30,
(in thousands, except per share data)
2017
 
2016
 
2017
 
2016
Net income
$
66,102

 
$
66,250

 
$
136,212

 
$
128,320

Net income attributable to unvested awarded performance stock
(1,642
)
 
(1,896
)
 
(3,329
)
 
(3,337
)
Net income attributable to common shares
$
64,460

 
$
64,354

 
$
132,883

 
$
124,983

Weighted average number of common shares outstanding – basic
140,173

 
139,998

 
140,143

 
139,395

Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic
(3,481
)
 
(4,006
)
 
(3,425
)
 
(3,625
)
Weighted average number of common shares outstanding for basic earnings per common share
136,692

 
135,992

 
136,718

 
135,770

Dilutive effect of stock options
2,409

 
1,589

 
2,346

 
1,490

Weighted average number of shares outstanding – diluted
139,101

 
137,581

 
139,064

 
137,260

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.47

 
$
0.47

 
$
0.97

 
$
0.92

Diluted
$
0.46

 
$
0.47

 
$
0.96

 
$
0.91