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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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 years ended December 31: 
(in thousands, except per share data)
2018
 
2017(1)
 
2016(1)
Net income
$
344,255

 
$
399,630

 
$
257,491

Net income attributable to unvested awarded performance stock
(8,297
)
 
(9,746
)
 
(6,705
)
Net income attributable to common shares
$
335,958

 
$
389,884

 
$
250,786

Weighted average number of common shares outstanding – basic
277,663

 
279,394

 
279,558

Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic
(6,692
)
 
(6,814
)
 
(7,280
)
Weighted average number of common shares outstanding for basic earnings per common share
270,971

 
272,580

 
272,278

Dilutive effect of stock options
4,550

 
5,006

 
3,330

Weighted average number of shares outstanding – diluted
275,521

 
277,586

 
275,608

Net income per share:
 
 
 
 
 
Basic
$
1.24

 
$
1.43

 
$
0.92

Diluted
$
1.22

 
$
1.40

 
$
0.91