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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
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 June 30,
 
For the six months 
 ended June 30,
(in thousands, except per share data)
2016
 
2015
 
2016
 
2015
Net income
$
66,250

 
$
61,005

 
$
128,320

 
$
117,956

Net income attributable to unvested awarded performance stock
(1,896
)
 
(1,439
)
 
(3,337
)
 
(2,802
)
Net income attributable to common shares
$
64,354

 
$
59,566

 
$
124,983

 
$
115,154

Weighted average number of common shares outstanding – basic
139,998

 
140,839

 
139,395

 
141,803

Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic
(4,006
)
 
(3,321
)
 
(3,625
)
 
(3,369
)
Weighted average number of common shares outstanding for basic earnings per common share
135,992

 
137,518

 
135,770

 
138,434

Dilutive effect of stock options
1,589

 
2,310

 
1,490

 
2,213

Weighted average number of shares outstanding – diluted
137,581

 
139,828

 
137,260

 
140,647

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.47

 
$
0.43

 
$
0.92

 
$
0.83

Diluted
$
0.47

 
$
0.43

 
$
0.91

 
$
0.82