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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding
The following is a reconciliation between basic and diluted weighted average shares outstanding:
 
For the three months 
 ended March 31,
(in thousands, except per share data)
2017
 
2016
Net income
$
70,110

 
$
62,070

Net income attributable to unvested awarded performance stock
(1,685
)
 
(1,451
)
Net income attributable to common shares
$
68,425

 
$
60,619

Weighted average number of common shares outstanding – basic
140,112

 
138,793

Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic
(3,368
)
 
(3,245
)
Weighted average number of common shares outstanding for basic earnings per common share
136,744

 
135,548

Dilutive effect of stock options
2,282

 
1,392

Weighted average number of shares outstanding – diluted
139,026

 
136,940

Net income per share:
 
 
 
Basic
$
0.50

 
$
0.45

Diluted
$
0.49

 
$
0.44