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Net Income Per Share
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Net Income Per Share Net Income Per ShareBasic net income per share is computed based on the weighted average number of common shares (including participating securities) issued and outstanding during the period. Diluted net income per share 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 September 30,
 
For the nine months 
 ended September 30,
(in thousands, except per share data)
2018
 
2017
 
2018
 
2017
Net income
$
106,053

 
$
75,913

 
$
270,803

 
$
212,125

Net income attributable to unvested awarded performance stock
(2,716
)
 
(1,852
)
 
(6,185
)
 
(5,181
)
Net income attributable to common shares
$
103,337

 
$
74,061

 
$
264,618

 
$
206,944

Weighted average number of common shares outstanding – basic
278,132

 
279,512

 
276,744

 
280,024

Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic
(7,124
)
 
(6,820
)
 
(6,321
)
 
(6,840
)
Weighted average number of common shares outstanding for basic net income per common share
271,008

 
272,692

 
270,423

 
273,184

Dilutive effect of stock options
4,274

 
5,094

 
5,191

 
4,838

Weighted average number of shares outstanding – diluted
275,282

 
277,786

 
275,614

 
278,022

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.38

 
$
0.27

 
$
0.98

 
$
0.76

Diluted
$
0.38

 
$
0.27

 
$
0.96

 
$
0.74